Question about 1998 Mitsubishi Montero Sport

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I need to replace the catalytic converter

I believe I have the correct part removed, after the oxygen sensor, and before the muffler

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May be some have them coming off the exhause manifolds

Posted on Jan 18, 2009

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Where is the 02 Oxygen Sensor before the cadalic converter on a 2006 Hyundai Santa Fe


Usually these are located on the exhaust manifold or just below the exhaust manifold and you should be able to see it in the engine bay. On V6 engines there will be one sensor on each of the 2 exhaust banks.
You will probably need to remove the engine cover to see the sensors on your exhaust.

If someone told you to replace these because you got a particular fault code I would be wary. A decent scan tool and basic diagnostics can show if the 02 sensor is working or not. Some faults often blamed on an 02 sensor are not due to faulty sensors.

Jan 09, 2016 | 2006 Hyundai Santa Fe

1 Answer

What is the most common cat oolitic converter that goes on the Avenger there is one on the manifold one at the base of the y pipe and one in midstream between Y pipe and muffler


Friend, your car has only one (1) catalytic converter. It may have one or two mufflers. Tenneco makes the Walker brand of mufflers and catalytic converters and have many for most cars. Check their online catalog to see it a system is available for your car. I would recommend you replace the one or two Oxygen sensors at the same time... poor gas mileage is often the result of failed Oxygen sensors. Most cars have two, some have only one. One may screw into the exhaust manifold (header pipe) and another after the catalytic converter. Good luck ;)

Apr 02, 2015 | Cars & Trucks

1 Answer

A po652 code on a 2008 cadillac cts.3.6 L. Car want to stall and will cut off when coming to a stop. Car will start back up and sometimes has a smelly oder coming out the exhaust.


Bad Oxygen sensor. Possibly _also_ bad catalytic converter. If less than (roughly) 70,000 miles, the converter is likely good. But your symptoms are 100% consistent with a bad oxygen sensor (which are sometimes attached directly to the catalytic converter). // Note: If you do need a catalytic converter, have it done at the Dealership. The ''muffler shops'' will install a generic (probably ''ceramic'') replacement, which could adversely affect performance, gas mileage, and _definitely_ not last more than a few years.

Jan 01, 2015 | Cars & Trucks

3 Answers

7e8 engine code


Catalyst System Efficiency Below Threshold (Bank 1) What does that mean?



The catalytic converter is a part of the exhaust system that looks kind of like a muffler, although it\'s job is very different from that of a muffler. A catalytic converter\'s job is to reduce emmissions from the exhaust. The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the P0420 (or in your case, a 7e8 code) code triggers the Check Engine Light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). Catalytic converters are not normally a "wear" type item, that is they are not deisgned to wear out and need replacement. If they have failed, it is likely due to something else that caused it to fail. Symptoms The main symptom to the driver is the illumination of the MIL (malfunction indicator lamp). You will likely not notice any drivability problems, although there may be symptoms. For example, if the substance inside the catalytic converter is broken or failed, it may be restricting the exhaust which will result in a feeling of reduced power output from the vehicle. Causes A code P0420 may mean that one or more of the following has happened: Leaded fuel was used where unleaded was called for A damaged or failed oxygen sensor (HO2S) Downstream oxygen sensor (HO2S) wiring damaged or connected improperly The engine coolant temperature sensor is not working properly Damaged or leaking exhaust manifold / catalytic converter / muffler / exhaust pipe Retarded spark timing The oxygen sensors in front and behind the converter are reporting too similar of readings Leaking fuel injector or high fuel pressure Cylinder misfire Oil contamination Possible Solutions Some suggested steps for troubleshooting a P0420 error code include: Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required. Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady). Inspect the downstream heated oxygen sensor (HO2S), replace if necessary Replace the catalytic converter Overall probably the biggest mistake vehicles owners make when they have a P0420 code is to simply replace an oxygen sensor (H02S). It is important to do proper diagnosis so you\'re not wasting money replacing parts unnecessarily. We strongly recommend that if you need to replace the catalytic converter that you replace it with an OEM unit. Second choice would be a high-quality replacement part. There are many stories in our forums where folks replaced the cat with a cheaper aftermarket one only to have the code return shortly thereafter. One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it\'s out of it\'s bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It\'s worth checking into.

Jul 22, 2014 | 2005 Ford Focus 1.6

1 Answer

What is fault code P0420


P0420 OBD-II Trouble Code Technical Description Catalyst System Efficiency Below Threshold (Bank 1) What does that mean? This diagnostic trouble code (DTC) is a generic powertrain code. It is considered generic because it applies to all makes and models of vehicles (1996-newer), although specific repair steps may be slightly different depending on the model. So this engine code article applies to Nissan, Toyota, Ford, GM, etc. The catalytic converter is a part of the exhaust system that looks kind of like a muffler, although it's job is very different from that of a muffler. A catalytic converter's job is to reduce emmissions from the exhaust. The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). Catalytic converters are not normally a "wear" type item, that is they are not deisgned to wear out and need replacement. If they have failed, it is likely due to something else that caused it to fail. Symptoms The main symptom to the driver is the illumination of the MIL (malfunction indicator lamp). You will likely not notice any drivability problems, although there may be symptoms. For example, if the substance inside the catalytic converter is broken or failed, it may be restricting the exhaust which will result in a feeling of reduced power output from the vehicle. Causes A code P0420 may mean that one or more of the following has happened: Leaded fuel was used where unleaded was called for A damaged or failed oxygen sensor (HO2S) Downstream oxygen sensor (HO2S) wiring damaged or connected improperly The engine coolant temperature sensor is not working properly Damaged or leaking exhaust manifold / catalytic converter / muffler / exhaust pipe Retarded spark timing The oxygen sensors in front and behind the converter are reporting too similar of readings Leaking fuel injector or high fuel pressure Cylinder misfire Oil contamination Possible Solutions Some suggested steps for troubleshooting a P0420 error code include: Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required. Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady). Inspect the downstream heated oxygen sensor (HO2S), replace if necessary Replace the catalytic converter Overall probably the biggest mistake vehicles owners make when they have a P0420 code is to simply replace an oxygen sensor (H02S). It is important to do proper diagnosis so you're not wasting money replacing parts unnecessarily. We strongly recommend that if you need to replace the catalytic converter that you replace it with an OEM unit. Second choice would be a high-quality replacement part. There are many stories in our forums where folks replaced the cat with a cheaper aftermarket one only to have the code return shortly thereafter. One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.

Read more at: http://www.obd-codes.com/p0420
Copyright © OBD-Codes.com

Jun 18, 2014 | 1996 Subaru Impreza

1 Answer

Where is location of bank 1/sensor 1 oxygen sensor v6 ?


Bank 1 means the side of engine which has #1 cylinder in it, which is the left or driver's side of the engine. Sensor 1 means it is the one closest to the exhaust manifold or before the catalytic converter, better known as "upstream" oxygen sensor. On the 4.3 V6 I believe this sensor is mounted in the exhaust manifold itself. You maybe able to access it from underneath the vehicle, or you may have to remove the "doghouse" interior engine access hood. The oxygen sensor has an electrical connector on it that has to be disconnected and the you may need a specialty socket called an oxygen sensor socket. the size of the hex on the oxygen sensor is 7/8".

Apr 27, 2014 | 2003 Chevrolet Astro

1 Answer

P 0420 code on toyota corolla2004


Hi there:
A code P0420 may mean that one or more of the following has happened:
  • Leaded fuel was used where unleaded was called for
  • A damaged or failed oxygen sensor (HO2S)
  • Downstream oxygen sensor (HO2S) wiring damaged or connected improperly
  • The engine coolant temperature sensor is not working properly
  • Damaged or leaking exhaust manifold / catalytic converter / muffler / exhaust pipe
  • ******** spark timing
  • The oxygen sensors in front and behind the converter are reporting too similar of readings
  • Leaking fuel injector or high fuel pressure
  • Cylinder misfire
  • Oil contamination

About the possible solutions, some suggested steps for troubleshooting include:
  • Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required.
  • Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
  • Inspect the downstream heated oxygen sensor (HO2S), replace if necessary
  • Replace the catalytic converter
Overall probably the biggest mistake vehicles owners make when they have a P0420 code is to simply replace an oxygen sensor (H02S). It is important to do proper diagnosis so you're not wasting money replacing parts unnecessarily.
We strongly recommend that if you need to replace the catalytic converter that you replace it with an OEM unit. Second choice would be a high-quality replacement part. There are many stories in our forums where folks replaced the cat with a cheaper aftermarket one only to have the code return shortly thereafter.

Hope this helps.

Dec 08, 2012 | 2001 Toyota Corolla

1 Answer

Where is the oxygen sensor located on umy 2000 town car?


A dual exhaust system has 4 Oxygen (o2) sensors. A single exhaust system has 3. As the diagram shows, your #1 sensors are towards the front of the vehicle threaded into the exhaust pipes coming directly off the engine. The #2 sensors are further downstream in the system closer towards the converter and muffler.

NOTE! Sometimes the threads on these strip out when being removed. Go slow at first. If it feels like it's getting tighter instead of looser: STOP and take it to an exhaust shop. They will have the proper tools to deal with it should it strip or break off.


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Sep 30, 2011 | Cars & Trucks

1 Answer

How do you drop the exhaust system to pull the oil pan 0n a 1997 Ford 2 liter Escort


Section 309-00: Exhaust Components - General Information 1997 Escort, Tracer Workshop Manual REMOVAL AND INSTALLATION Three Way Catalytic Converter (TWC) Removal
  1. svf~us~en~file=ani_caut.gif~gen~ref.gif CAUTION: When servicing the exhaust system or removing exhaust components, disconnect the heated oxygen sensors at the wiring harness to prevent damage to the sensors and harness.
    Disconnect the heated oxygen sensor (HO2S) electrical connectors.
  1. Remove the (A) five nuts and remove the (B) exhaust manifold heat shield.
  1. Remove the four exhaust manifold to three way catalytic converter (TWC) nuts.
  1. Raise and support the vehicle; refer to Section 100-02 .
  1. Disconnect the downstream HO2S and position it aside.
  1. Remove the two TWC bracket bolts.
  1. Remove the two (A) TWC to muffler inlet pipe bolts and nuts and the (B) TWC. Discard the gasket.

Jun 06, 2011 | Ford Escort Cars & Trucks

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