Removing Catalytic Converter O2 Sensor

The size of our oxygen sensor plugs M18 x 1. Find the part called a spark plug defouler. Bypassing an oxygen sensor--also called an O2 sensor--can only be done using a dummy O2 sensor. He goes over how to remove an old, failing catalytic converter, and install a brand new Magnaflow replacement catalytic converter on many vehicles. i know thier there for a reson but in idaho i dont. P0420 or P0421 would indicate that the catalyst is not operating properly. Before installing our new catalytic converter into the vehicle we'll have to remove these plugs in the O2 sensor bungs. You have 2 sensors. $60 on a bank 2 primary O2 sensor, $175 non OEM catalytic converter, and another $60 on a secondary O2 sensor. The ceramics in one of them have broken and started to rattle. It is located behind the Catalytic Converter making it the downstream O2 sensor. It sounds a lot meaner on idle and especially on WOT. Can a bad catalytic converter cause O2 sensor issues. If necessary, loosen double and single clamps and align muffler and exhaust pipe so that. It might seem quite strange to most of us that in the 21st century we are still driving cars that run by burning oil, but until this changes, there is still a lot we can do to help give mother nature a little hand. If you punch out the guts of a converter on any car 96 and newer that will just bring the light back on. My dads car is not in the scope of the Vin numbers mentioned but still has the factory catalytic converter. No need bypass sensor / retune etc. A rear O2 sensor replacement at around 250K got rid of the P0420 for a while. I found that means the bank 1 front catalytic converter is operating below expected threshold. Free 2-day shipping. A week later cel came back on. In this How To video, J shows you how to change a catalytic converter. Universal O2 Spacers with real precious metal Catalytic Converters scrub the exhaust and lengthen the distance between the O2 sensor(s) and the exhaust flow to greatly reduce the chance of a check engine light or CEL. What is the most important emissions control device on a vehicle today? The catalytic converter, because it cleans up any exhaust pollutants that exit the engine. My WJ passed Roadworthy 3 months ago, without cat, with no inspection of the system being installed or not. Further to my video about upstream sensors, here are a few points relating to downstream (after cat) O2 sensors and using them for some basic tests. The cat will do the final cleaning of the emissions. O2 sensor failure *will not* cause the P0420 to set, but rather will give sensor failure codes. Reply With Quote. From that standpoint, a "catalytic converter cleaner" is gimmicky. Use the temperature gauge to read the input and output flanges after the catalytic converter. When you remove your catalytic converter, your post O2 sensor will see higher temperatures and greater flow of unburnt fuel. Under normal operating conditions, the downstream O2 sensor should have little switching activity. This may very temporarily change the firing conditions of the engine and clear the check engine light, however if the O2 sensor is bad or the CAT is bad the problem is just going to come back and very quickly. i know thier there for a reson but in idaho i dont. The guy who installed my headers left out the front O2 and I thought he was talking about the back ones like I had instructed him too. #4 - Oxicat Oxygen Sensor and Catalytic Converter Cleaner Made in Germany, Oxicat is designed to clean the entire exhaust system by removing carbon deposits and soot throughout. The 2 Downstream sensors were a bitch to get out, and I actually had to run a Thread Tap through the holes to allow me to put in the new sensors. And it will help get rid of that annoying check engine light you get after modifying your exhaust or removing your catalytic converter, and sometimes even when installing a high. Pre and post levels are steady at 750 mV, no change under load. The converter's job is to reduce emissions out the tailpipe. Best Catalytic Converter Cleaner All of us know the huge problems that the world now faces from global warming. This can only be done with a specific kind of tool known as an O2 wrench, but you can purchase one from parts dealers for between $30 and $40. Then, locate the catalytic converter at the center of your exhaust system and remove the oxygen sensor with a ratchet wrench. Locate the oxygen sensor that is downstream (closer to the tailpipe) of the catalytic converter. Even if you replace with suitable catalyst don't expect such a significant fuel improvement. Hydrocarbons or unburned fuel are potential factor for CC failure. If you want to get the most out of your vehicle, this PaceSetter product is second to none. A catalytic converter is essential to your vehicle’s emission system; it functions by transforming "raw" exhaust into less environmentally damaging gases. Well I've heard that a clogged cat can also cause the same code to pop up. Step 4 - Remove catalytic converter from head pipe (or buy one) The catalytic converter on the Harley Davidson Touring bikes is contained within the header collector pipe, with no easy way to get to it. This time it was bad rear O2 sensor. Loosen and remove the alternator. Removing the sensor before removing the heat shield will make it easy to remove the heat shield. You can remove the O2 sensor completely and replace it with a threaded bung (metal threaded cap) by turning the sensor out of the pipe with a wrench and then by threading the bung into the hole. Universal O2 Spacers with real precious metal Catalytic Converters scrub the exhaust and lengthen the distance between the O2 sensor(s) and the exhaust flow to greatly reduce the chance of a check engine light or CEL. Buy OXICAT - Oxygen Sensor & Catalytic Converter Cleaner: Catalytic Converters - Amazon. Locate the oxygen sensor that is downstream (closer to the tailpipe) of the catalytic converter. The car has a real hard time going anything above 25 and will begin to choke out if you floor it. One sensor is placed before the catalytic converter, and is called the "upstream" oxygen sensor. All cars and light trucks ( under 8800 lbs gvw ) after 95 have this. First make sure the car is cool. Vehicles have either one or two post cat oxygen sensors and an o2 simulater should be installed on each post cat sensor to remove p0420 and p0430 check engine light codes for a bad or missing catalytic converter. Oxygen Sensor Locations. 2 out of 5 stars 15. Here's some signs to watch for, and what to do about it. OBD II readiness tests for catalytic performance passed. (It's still tight, but manageable) 2. Shop safely with us online or call 888-844-3393 and buy the quality part your car or truck needs today. 2L Universal Catalytic Converter Recommendation; Will Universal Catalytic Converter Fit a Kia Rio if the O2 Port is in a Different Place; Universal Stainless Catalytic Converter With 2. A bad oxygen sensor that prevents the PCM from going into closed loop won't damage the converter, but it may prevent the converter from reducing HC and CO as much as it could. There are two oxygen sensors: one is upstream of the catalytic converter and one downstream of the catalytic converter. P0430: Catalyst System Efficiency Below Threshold (Bank 2) The P0430 check engine light code, like P0420, means the catalyst system efficiency is below the required threshold. Universal Catalytic Converters may be used on most cars and light trucks on the road today, but to be installed on a vehicle they do in most cases require, specific cutting and welding of the exhaust system. You may have to remove the keeper for the wiring harness here in order to get enough slack to remove it without having to disconnect the connector. Keep the O2 sensor in the same location, however, backspace it with a spark plug non-fouler (drill a larger hole on the thread going into the O2 bung so the O2 sensor can read. The second sensor is under less presure of course. If I was going to replace a sensor prior to a solid DTC being logged, it would be the air/fuel ratio sensor located upstream of the catalytic converter. Removing the sensor before removing the heat shield will make it easy to remove the heat shield. This Cataclean Catalytic Converter, O2 Sensor, Valve and Fuel Injector Cleaner is a fuel and exhaust system cleaner that's made to reduce carbon build-up. So I spent a lot more time than I normally do making sure to get it right. O2 Simulator Mini Cat, Angled, Straight Cel Fix, Big Daddies Garage stainless steel Oxygen Sensor Simulator is used to clear p0420 / p0430 codes for bad or missing catalytic converters. Question: Why Does Removing The Catalytic Converter Cause A Backfire, I know some people that removed their catalytic converters (illegal and not capable of passing emission tests I know), and the car immediately became capable of backfiring. Then, locate the catalytic converter at the center of your exhaust system and remove the oxygen sensor with a ratchet wrench. elaborate more. Here's some signs to watch for, and what to do about it. How to clear a clogged catalytic converter. Plus, the ever present bugbear of low end loss lurks with the removal of the cats, I believe. *This O2 cel fix with miniature cat will trick your ECU into thinking the stock catalytic converter is still installed. >what do This is my theory, I bought a non-CARB compliant catalytic converter because I don't live in places such as NY or Cali. catalytic converters do fail but the fault code is set due to rear O2 sensor value(s) being out of line. Step 3 – Remove the exhaust catalytic converter. Oxygen sensors are part of the vehicle's emissions control system and it may or may not be legal to replace the O2 sensor with a dummy sensor. The amount of oxygen in the exhaust varies according to the air/fuel ratio of the fuel injection system. I bought an O2 sensor removal socket that works perfect for the driver side, but how do you get to the passenger side one?. Catalytic Converter Removal ? ? ive heard you can get spark plug defoulers for the o2 sensor to keep the SES light off but the ones i found wouldent fit, also you. Sensor 2 is the downstream sensor, in the catalytic converter, smack in the middle of the underside of the car. Removing a 5. There are few instances in which it is allowable to remove the catalytic converter and install a bypass pipe. Do you occasionally get code P0420 - catalytic converter low efficiency? This $3 electrical circuit may fix the problem permanently by electrically smoothing out the o2 sensor output. The iO2 was originally developed as tool to aid in the diagnosis of catalytic converter and oxygen sensor fault codes. Kia Forte 1. Does that temp sensor have any effect of carburetor metering of fuel? I also filled up with 94 octain right after I removed the converter. If so, then disconnect the exhaust pipe at the exhaust manifold and try it again. A few months ago, I was having my exhaust system worked on and the O2 sensors had to be removed to facilitate the work. What the mechanic is not telling you is that it might just be a malfunctioning sensor, or the catalytic converter may be full of crud. I believe it's illegal to remove per federal law. That O2 sensor is useless. Position: Front. What is the most important emissions control device on a vehicle today? The catalytic converter, because it cleans up any exhaust pollutants that exit the engine. if you have two, try pluging the pre-cat one in, but using the resistor on the after cat one. It might be difficult if it has become rusted into place, in which case you may want to spray some lubricating oil on it. The dealership confirmed it's the catalytic converter (front and rear apparently ) My 2000 SR5 has about 147,000 miles on it and I believe at least one O2 sensor was replaced prior to me buying it a month ago. Re: How can I bypass the catalytic converter o2 sensor on my 04 GLI (Mafiamike954) 11-05-2009 12:43 PM #2 Maybe try a O2 spacer or get a software that eliminates the rear O2 sensor. P0430, o2 Sensor or Catalytic Converter?? was created by NissanMaxx Hello everybody. Order your 2002-03 Nissan Altima Sentra Catalytic Converter with Downstream Oxygen Sensor with Upstream Oxygen Sensor 4 Piece Set - 1AEEK00318 today at 1AAuto. Incorrect ignition timing—You guessed it. Just reading the details on the link Peter provided sounds very much like the problems that happen when shrapnel from the catalytic converter break off and enter the engine cylinders I wonder what their "fix" is - a replacement convereter or complete removal of it (and replace it with a length of straight-through piping)? ---. You lost power because you relocated your FRONT O2 sensor. The catalytic converter recently failed and caused the exhaust to clog up. My guess is the front O2 sensor is bad and you need replacing, it can take less than 30 min to swap the parts if you are mechanically illiterate. You don’t want to mess with the oxygen sensor before the catalytic converter because that is the one that controls the fuel mixture in the engine and regulates things. A catalytic converter is essential to your vehicle’s emission system; it functions by transforming "raw" exhaust into less environmentally damaging gases. Do to todays ecm's checking cat with o2 sensors. • Restore the exhaust system by creating a straight pipe to facilitate. How to replace the rear oxygen sensor P0136. Older vehicles had a single O2 sensor in the engine compartment, closer to the exhaust manifold. Step 4 – Remove catalytic converter from head pipe (or buy one) The catalytic converter on the Harley Davidson Touring bikes is contained within the header collector pipe, with no easy way to get to it. I hate catalytic converters and my state doesn't do vehicle inspections. Removing the catalytic converter will save alot more money than replacing it and will make your engine exhale better and last longer due to the removal of a suffocation device "cat" only issue outta all the ones I've removed it is if the downstream O2 sensor is plugged directly in it, which there are ways around. HI , Its a resistor that replaces the oxygen sensor (i think), so the cat converter is bypassed. it uses O2 sensors to do so, and expects the readings from the sensors to be within a certain range. Re: Removing XJ Catalytic Converter Not sure what year your XJ is but on the newer models the cat has an o2 sensor after it. If the voltage of the downstream O2 sensor is constantly jumping between 0. The vehicle will run just fine, but you'll pay if you're caught. Reports where it worsens running conditions are likely if the sensor is bad or old. These methods for bypassing the O2 sensor are for the second O2 sensor or the one that is after the catalytic converter. But do not hollow it out, you will only lose power, replace it with a pipe; either welded on (best choice) or clamped on. This way you will have a normally functioning check engine light should you have any actual faults. Step 3 – Disconnect the wiring harness. If you want to take it a step further, remove your pre-cats (if your car has them) and also remove the stock airbox and get a K&N air filter (or aftermarket intake) as well. Keep the O2 sensor in the same location, however, backspace it with a spark plug non-fouler (drill a larger hole on the thread going into the O2 bung so the O2 sensor can read. When you remove your catalytic converter, your post O2 sensor will see higher temperatures and greater flow of unburnt fuel. i have a 2007 dodge charger R/t AWD and i noticed my gas mileage went from getting over 300 plus per full tank to not even 200. It measures the air-fuel ratio of the exhaust coming out of the exhaust manifold and sends the high and low voltage signals to the powertrain control module in order to regulate the air-fuel mixture. There are few instances in which it is allowable to remove the catalytic converter and install a bypass pipe. Remove Catalytic converter, starting at the exhaust manifold. Any changes in pressue usually lead to o2 sensor failures which cause serious problems with the fuel/air management. A catalytic converter is essential to your vehicle's emission system; it functions by transforming "raw" exhaust into less environmentally damaging gases. Remember that there can be other causes of the P0420 trouble code like faulty O2 sensors or exhaust leaks and the problem may not be in your. If your state does emission inspections, you may be risking trouble (getting turned in) if they spot a test pipe. Good mechanics know how to do this. include removing the O2 sensor in front of the cat (will cause performance and emissions issues, also illegal. Installing a test pipe should not have any ill affects on the sensor. I've had the P0420 code for over 5 years now. This way you will have a normally functioning check engine light should you have any actual faults. It takes twisting and turning but it will drop out. Keep your spark plugs and air filters in good shape. P0430: Catalyst System Efficiency Below Threshold (Bank 2) The P0430 check engine light code, like P0420, means the catalyst system efficiency is below the required threshold. If you have post catalytic converter oxygen sensor, then removing CC will seriously degrade engine performance and might generate problem codes. How a Catalytic Converter Works. So if a person was to remove the cat converter and remove and replace the urd o2 sensor with a o2 simulator. I would recommend getting it custom tuned by someone using HP tuners, you can turn off that code in the tune and the light will not be on. I could be a failing O2 sensor as well, running the system to lean or rich. Some cars require that you remove more than one pipe. The factory cat was old technology and lost about 10 hp. Locate the oxygen sensor that is downstream (closer to the tailpipe) of the catalytic converter. The catalytic converter recently failed and caused the exhaust to clog up. You can remove the catalytic converter. I noticed a gain in power also, then I loaded a cutom SCT tune from my dyno-guy (Pete Johnson, performance-dyno, Concord, NH. When you remove your catalytic converter, your post O2 sensor will see higher temperatures and greater flow of unburnt fuel. Question: Why Does Removing The Catalytic Converter Cause A Backfire, I know some people that removed their catalytic converters (illegal and not capable of passing emission tests I know), and the car immediately became capable of backfiring. Remove old catalytic converter: some catalytic converters are screwed to the exhaust pipe using two bolts on each side, while others are welded. Figured it if didn't work, no harm done as the sensor was throwing codes anyway. Re: Removing Catalytic Converter. If the catalytic converter is breaking HC, CO, and Nox into their component parts, the downstream oxygen sensor will display a constant voltage. Obviously, both camps can't be correct. Focus is misfiring or the exhaust timing is off. Re: Recall Catalytic Converter & O2 Sensor Breakage I have been working on my dads 2004 Xtrail only done 140,000kms and came across this thread. Had the head gasket replace several years ago. So I'm back to square one. You have 2 sensors. The size of our oxygen sensor plugs M18 x 1. How to replace the rear oxygen sensor P0136. For example the O2 sensor is too sensitive. This O2 cel fixture with a miniature cat will make your ECU think the inventory catalytic converter is still installed. 1)This O2 cel fix actually has a miniature catalytic converter built inside and will help get rid of that annoying check engine light you get after modifying your exhaust or removing your catalytic converter, and sometimes even when installing a high flow catalytic converter. Catalytic Converter and Oxygen Sensor Cleaner. Oxygen sensors are part of the vehicle's emissions control system and it may or may not be legal to replace the O2 sensor with a dummy sensor. Remember that there can be other causes of the P0420 trouble code like faulty O2 sensors or exhaust leaks and the problem may not be in your. It took a few "turn off" cycles before the code popped up and I checked the front sensor to see it was floppin in the wind. The car sounded like it had an exhaust leak as well. The short answer is: Yes, the BoosterPlug and the O2 (Lambda) sensor will prevent the motorcycle engine from running too lean - with or without the catalytic converter in the exhaust system. The catalytic converter on a 1994 Buick LeSabre can be removed to be replaced. Your computer needs to see you post Cat O2 sensors pretty much flat lined, unlike your upstreams that will switch consantlty adapting from rich to lean, rich to lean. Plus, the ever present bugbear of low end loss lurks with the removal of the cats, I believe. Next, remove the oxygen sensor and start it up. If the catalytic converter is working as intended, the upstream O2 sensor reading should reflect a fluctuating graph, which represents the engine switching between lean and rich mixtures. The MagnaFlow Stainless Steel Catalytic Converter w/ O2 Port - Universal part # MF94139 has the O2 sensor port hole located on the outlet side of the converter. i finally figured out that the o2 sensor is whats causing the. Step 2 - Take second test with an infrared thermometer. G's Garage 12,772 views. I was told many different things by various mechanics as to whether or not it is advisable to remove the failed cat and run it without one. It takes twisting and turning but it will drop out. 2 DME will adjust the mixture based on the sensor data and this is a good thing. Use the temperature gauge to read the input and output flanges after the catalytic converter. If you punch out the guts of a converter on any car 96 and newer that will just bring the light back on. The oxygen sensor, or O2 sensor is usually located near the catalytic converter. Step 1 - Removing the Sensor. Catalytic converter removes about 90% or more of the harmful emssions. Crossover clamp. The front O2 sensor monitors the exhaust gases out of the engine. im removing my catalytic converter mainly for better fuel efficiency, but will my exuast be louder and will i get a few more horses. Oxygen sensors are part of the vehicle's emissions control system and it may or may not be legal to replace the O2 sensor with a dummy sensor. You will need to do this before you unbolt your catalytic converter from the. The read the before and after exhaust and trigger your check engine light is something is not right. after several researches online, i stumbled on the solution, applied it and IT WORKED FOR ME!!! The idea behind it is when you remove the cat the 2nd O2 sensor is going to have too much air reaching the. It depends on the car some have O2 sensors in front and behind the Cat those cars often require messing with the electronics so that the fuel consumption does. Friendlyx Member. Faulty oxygen sensor will set different codes, for things like no response, lean mixture, faulty heater circuit, etc. In any case, I am going to test my O2 sensor for proper operation, put new stock plugs in the car as I have a misfire in light accel conditions and though this could be other things, I have never changed them and of course will inspect them first. Often, the check engine light will come on to provide ODII trouble codes to check with a code reader. The more easily an engine functions and the less work it has to do results in less friction, less load and, ultimately, a lower operating temperature. You will need to use the O2 sensor socket and ratchet to remove it from the exhaust manifold. uk: Car & Motorbike friend got it for me from UK and it made a difference. MagnaFlow does offer converters that will mount the O2 sensor on the inlet side of the converter, but that are made for specific model vehicles. He is checking to see how the downstream O2 sensor is behaving. 8L 2014, Exhaust Manifold with Integrated Catalytic Converter by PaceSetter®. It might work. You can remove the O2 sensor completely and replace it with a threaded bung (metal threaded cap) by turning the sensor out of the pipe with a wrench and then by threading the bung into the hole. It treats the entire exhaust tract, and especially the catalytic converter and o2 sensor. This may very temporarily change the firing conditions of the engine and clear the check engine light, however if the O2 sensor is bad or the CAT is bad the problem is just going to come back and very quickly. The catalytic converter is designed to convert harmful emissions, produced by an internal combustion engine, to less-harmful elements: H2O (Water), CO2 (Carbon Dioxide) and N2 (Nitrogen). Catalytic Converter Removal | DoItYourself. Recommendation on a Catalytic Converter With O2 Sensor On the Inlet Side ; Universal Catalytic Converter Fit on a 2005 Ford F-150 4. If you are still determined to remove the Catalytic converter, then you will have to take off the O2 sensor. Step 5 - Remove and replace your catalytic converter (if needed) If the catalytic converter isn't working properly, now is the time to replace it. Kia Forte 1. #4 - Oxicat Oxygen Sensor and Catalytic Converter Cleaner Made in Germany, Oxicat is designed to clean the entire exhaust system by removing carbon deposits and soot throughout. Most especially, the year of the vehicle in question. When the car is running at this level, also called the stoichiometric mixture, it has reached a high level of efficiency and the catalytic converter is also working at its best. Plus, the ever present bugbear of low end loss lurks with the removal of the cats, I believe. Removing the catalytic converter will save alot more money than replacing it and will make your engine exhale better and last longer due to the removal of a suffocation device "cat" only issue outta all the ones I've removed it is if the downstream O2 sensor is plugged directly in it, which there are ways around. When you remove your catalytic converter, your post O2 sensor will see higher temperatures and greater flow of unburnt fuel. Installing a test pipe should not have any ill affects on the sensor. Good mechanics know how to do this. Oxygen Sensor is bad. Re: Removing Catalytic Converter. Universal O2 Spacers with real precious metal Catalytic Converters scrub the exhaust and lengthen the distance between the O2 sensor(s) and the exhaust flow to greatly reduce the chance of a check engine light or CEL. However, I can't get the cat out from under the vehicle. If the code indicates a bad cat…then further tests need to be run to determine if it’s a bad O2 sensor or a bad cat. The front O2 sensor monitors the exhaust gases out of the engine. O2 Simulator Mini Cat Cel Fix, Big Daddies Garage Mini Catalytic Convertor Rear Oxygen Sensor Simulator is the best and easiestway to clear p0420 / p0430 codes for bad or missing catalytic converters. as for back preassure. You may need the o2 sensor removal tool to get it off without breaking it. First O2 Sensor Basics video: https://youtu. Temporary exhaust leak test - If the converter is clogged, you will notice an increase in performance by opening the exhaust before the converter. Question: Why Does Removing The Catalytic Converter Cause A Backfire, I know some people that removed their catalytic converters (illegal and not capable of passing emission tests I know), and the car immediately became capable of backfiring. If your car is of that period and symptoms like excessive fueled use, lack of power and illuminated check engine light suggest the oxygen sensors failed, it wouldn't hurt to replace it. Most newer vehicles have more than one (and as many as four), with the second sensor farther down the exhaust pipe, closer to the catalytic converter. The other side is roughly a mirror image, but requires some moving of the car's intake parts to gain access to the O2 sensor. If you are still determined to remove the Catalytic converter, then you will have to take off the O2 sensor. 2 out of 5 stars 15. $60 on a bank 2 primary O2 sensor, $175 non OEM catalytic converter, and another $60 on a secondary O2 sensor. It determines this by comparing the switching frequency of the front o2 sensor to the back o2 sensor, and if the back o2 sensor is switching approximately less than twice as fast as the front one, it throws the code. Find the part called a spark plug defouler. i finally figured out that the o2 sensor is whats causing the. Hi, just FYI but I updated the thread title so it would be more visible if people are searching for related information regarding the catalytic converter, P0420, P0430, and diagnosis. 2 DME will adjust the mixture based on the sensor data and this is a good thing. To the original question: The only way the ECU knows a cat is bad by the readings it get from the O2 sensors. Remove the O2 sensor with an O2 sensor socket and ratchet If the O2 sensor will not remove, cut the O2 sensor wire and remove it with a 7/8 inch socket step : Removing the Catalytic Converter (3:18). Insert a new dummy O2 sensor and reconnect the electrical plug to the O2 sensor. He goes over how to remove an old, failing catalytic converter, and install a brand new Magnaflow replacement catalytic converter on many vehicles. Installing your post cat O2 sensor without a Catalytic converter installed will make your Malfunction Indicator Lamp come on. But this is rare. Replacing Old O2 Sensors When Replacing a Catalytic Converter Question: IF I CHANGE SENSORS WITH MY NEW ASSEMBLY SHOULD I RUN IT IN WITH THE OLD SENORS TO BURN OFF ANY POSSIBLE OILS THAT PIPE MAY BE COATED WITH THUS AVOIDING SENSOR CONTAIMATION?. Based on it's measurements, it tells the ECU to add/remove fuel from the mixture. The cat will do the final cleaning of the emissions. Catalytic Converter O2 Sensors New cars, and most cars produced after 1980, have one or more oxygen sensors which contain small amounts of platinum. Remove the sensor, and take to your local car parts store. Neglecting to replace a bad oxygen sensor will usually result in damage to your catalytic converter, costing you an extra $500 -$1000 in repairs if not more. O2 sensor is used to accurately set the air fuel mixture, you need to have one in good working condition. Even more importantly, ignoring a faulty oxygen sensor can eventually damage the catalytic convertor which is very expensive to replace. Can I remove 2nd o2 sensor in NB miata? - posted in Spec Miata Garage: I have a 2002 Spec Miata. Shop safely with us online or call 888-844-3393 and buy the quality part your car or truck needs today. The converter was 60% plugged and the temp light was on most of the time. Replace your catalytic converter with a stainless steel straight pipe and watch your MPGs soar. If the catalytic converter is breaking HC, CO, and Nox into their component parts, the downstream oxygen sensor will display a constant voltage. P0420 or P0421 would indicate that the catalyst is not operating properly. The converter's job is to reduce emissions out the tailpipe. If the catalytic converter is breaking HC, CO, and Nox into their component parts, the downstream oxygen sensor will display a constant voltage. Look at Long Term Fuel Trims (LTFT). Focus is misfiring or the exhaust timing is off. It is not a "bad sensor" bypass. You guys saying otherwise have other issues like you jacked your O2 sensor up or it just needs replacing. Can a bad catalytic converter cause O2 sensor issues. is proud to be the distributor for Catco Universal Catalytic Converters. Removing Catalytic Converters and Disconnecting O2 Sensors. If I'm not mistaken, removing the catalytic will cause the sensor to continually lean out the fuel mixture until you cause real problems for your car. Just pushes the o2 sensor further away from the exhaust flow so it thinks you still have a working cat. This O2 cel fix actually has a miniature catalytic converter built inside and will help get rid of that annoying check engine light you get after modifying your exhaust or removing your catalytic converter, and sometimes even when installing a high flow catalytic converter. Some of the processes seen here are specific to this exact vehicle application. In any case, I am going to test my O2 sensor for proper operation, put new stock plugs in the car as I have a misfire in light accel conditions and though this could be other things, I have never changed them and of course will inspect them first. Cars with multiple O2 sensors: Starting around 1994, and definitely by 1996, all cars have multiple O2 sensors. Removing the catalytic converter will save alot more money than replacing it and will make your engine exhale better and last longer due to the removal of a suffocation device "cat" only issue outta all the ones I've removed it is if the downstream O2 sensor is plugged directly in it, which there are ways around. That O2 sensor is useless. disconnecting oxygen sensor after removing catalytic converter, how to unplug the o2 sensor from the cat, if the catalytic converter is removed should the 02 sensor be disconnected also, isidoyu, k20 delete unplug o2 sensors, motorcycle disable o2 engine heat, remove cat and air sensor from motorcycle, removing o2 sensor from exhaust, should i. Blocks 002, 030, 032 and 033 are done in "Measuring Blocks" while blocks 036, 034 and 046 are done in "Basic Settings". Not sure how is it on yours, but on mine it is before cat converter, so will not make much difference. Plus, the ever present bugbear of low end loss lurks with the removal of the cats, I believe. If you want to remove the O2 sensor you need a chip that doesn't have support for it. Re: How can I bypass the catalytic converter o2 sensor on my 04 GLI (Mafiamike954) 11-05-2009 12:43 PM #2 Maybe try a O2 spacer or get a software that eliminates the rear O2 sensor. The second place that I went to, Maximum Automotive (local here in Naperville, IL). Bank #1 is the side of the engine that contains cylinder #1. The size of our oxygen sensor plugs M18 x 1. To the original question: The only way the ECU knows a cat is bad by the readings it get from the O2 sensors. If you want to replace a sensor first in hopes that will make the engine ECU think the catalytic converter is OK, then you would want to replace the air fuel ratio sensor which is upstream from the catalytic converter. Based on it's measurements, it tells the ECU to add/remove fuel from the mixture. Over time, a second O2 sensor was installed downstream of the converter. Bypassing an oxygen sensor--also called an O2 sensor--can only be done using a dummy O2 sensor. Auto Zone gave me a free estimate and told me WHY I was losing gas so fast- its either the Oxygen sensor or the Cat converter. 1 - The role of the Oxygen sensor The o2 sensor (oxygen sensor) is located within the exhaust system, upstream of the catalytic converter. hands in that small space to get the bolts to tge top of the converter. Then, locate the catalytic converter at the center of your exhaust system and remove the oxygen sensor with a ratchet wrench. Step 2 - Removing the Converter. Its two electrodes provide an output voltage corresponding to the quantity of oxygen in the exhaust relative to that in the atmosphere. How to replace the rear oxygen sensor P0136. The guy who installed my headers left out the front O2 and I thought he was talking about the back ones like I had instructed him too. Under normal operating conditions, the downstream O2 sensor should have little switching activity. I found that means the bank 1 front catalytic converter is operating below expected threshold. This is a classic sign that your catalytic converter is starting to fail. Get it and drill it out with a 1/2 inch bit and scew it inline with the cat and o2 sensor. O xygen sensor downstream of the catalytic converter in the exhaust system on the back of the engine. Removing the cats WILL trigger a check engine light because the O2 sensors are seeing the same levels of emissions, which makes the ECU think the catalytic converter has failed, so it triggers a CEL (check engine light) to get you to get it fixed. I bought a new bolt catalytic converter the other day to replace the old. You can get around this by fitting a spacer on the downstream lambda (O2) sensor. So it goes o2 sensor, drilled out non fouler, regular non fouler, cat. If the oxygen sensor or the converter is failing, disconnecting the battery will clear the codes and, if there is a problem, the light will come back on with new codes. Universal O2 Spacers with real precious metal Catalytic Converters scrub the exhaust and lengthen the distance between the O2 sensor(s) and the exhaust flow to greatly reduce the chance of a check engine light or CEL. First make sure the car is cool. Before I'd replace a cat, I'd carefully read the data from the front and rear O2 sensors to be sure I think that the cat's bad. You have 2 sensors. The car has 116,000 mi on it. For example the O2 sensor is too sensitive. P0420 — Is it the catalytic converter or the oxygen sensor? How to diagnose P0420 to determine if the problem is the catalytic converter or the oxygen sensor? I see this question all the time on auto forums. Catalytic Converter Removal ? ? ive heard you can get spark plug defoulers for the o2 sensor to keep the SES light off but the ones i found wouldent fit, also you. The O2 sensor behind the first catalytic converter is bad and he said that that was where the exhaust was getting caught up. Removing the cats WILL trigger a check engine light because the O2 sensors are seeing the same levels of emissions, which makes the ECU think the catalytic converter has failed, so it triggers a CEL (check engine light) to get you to get it fixed. Recommendation on a Catalytic Converter With O2 Sensor On the Inlet Side ; Universal Catalytic Converter Fit on a 2005 Ford F-150 4. This tells the computer how to adjust itself based on the amount of pollutants leaving the cat. Hydrocarbons or unburned fuel are potential factor for CC failure. When the signal from the O2 sensor is detected by the PCM as being stuck Rich or biased Rich, this DTC is set. It is not a "bad sensor" bypass. After working on the exhaust system make sure that the system is not under stress, and that it has sufficient clearance from the bodywork. 2 DME will adjust the mixture based on the sensor data and this is a good thing. If you cut it off on newer vehicles, there is a good chance it will run like s%^t due to the 02 sensors. The purpose of the rear oxygen sensor(s) is to monitor the oxygen content of the exhaust gases leaving the catalytic convertor. The 2 O2 sensors upstream from the catalytic convertors came out just fine, and the new one went in just fine. If it is a clogged cat it will scream like a banchee and rev up to its normal 4000 rpm. I bought an O2 sensor removal socket that works perfect for the driver side, but how do you get to the passenger side one?. The size of our oxygen sensor plugs M18 x 1. Good to go! Exhaust sound: The sound has greatly improved. The catalytic convertor is after the O2 sensor. I removed and replaced a Rav 4 catalytic converter recently. I have a 93 Hijet. The items you will need for this are: the new downstream O2 sensor from 1AAuto.