Question about Mitsubishi Lancer

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My 2002 Lancer's check engine light keeps coming on. I have replaced the catalytic converter with a rebuilt and one of the O2 sensors has been replaced.My mechanic wants to try replacing the other O2 sensor ($170) and says that if that doesn't solve it we may have to put a factory catalytic converter in which would be big dollars. Any ideas?

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  • gr00veNYC Apr 17, 2009

    Did you find a fix for this? I've been getting the same thing and I also had the catalytic coverter changed. It's pissing me off because I'm not a car guy.

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Aftermarket converters can cause catalytic converter monitor issues, these are not O2 sensors, they are catalytic converter efficiency monitors, I know they look like a O2 sensor but they are very different in how they work, what are the codes you are getting.

Posted on Nov 05, 2008

  • Jossue Sanabria Aug 05, 2011

    THe 2002 mitusbishi lancer has a precat with an o2 sensor and the cat underneath ....so you may want to find out if the one in the engine bay is not good.. before you go slapping another o2 sensor... because it will eventually go bad aswell.. go on ebay and look up a o2 bosch makes them pretty high end and probably cheaper than any autoparts

  • yadayada
    yadayada Aug 05, 2011

    You do relaize this is a 3 year old posting???

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I have a 2002 chevy impala I changed the 02 sensor and my check engine light is still on and reading the same 02 sensor


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I have Service engine light on for my nissan 2001 maxima. Dealer ran the diagnostics and said Bad o2 Sensor. Today , the Service engine light is gone.. Do I need to replace the part anyway or wait for the...


if it comes back, yes you will need. without pre o2 sensor your car wont idle, it will use lots of fuel and you will face drivability problems if it is post o2 sensor, it is there to check if catalytic converter is ok or not(it won caue drivability problems but may consume little more fuel to run rich and to save catalytic converter). if sensor is broken you need to replace it. if you have error for post o2 sensor but it is ok, this means your catalytic converter is going bad.

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if vehicle has less than 200,000 kms then i think cat is ok ,check the O2 sensors with a automotive meter rather than reading the obdii ,which i cannot do anyway in europe but at least you will know if they work or not their are two O2 sensors on each cat one before the and one after ,unless this is a high mileage vehicle i dont think the cats will be gone

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Code p0420 is 'catalyst efficiency below threshold'.

This could be caused by a bad catalytic converter but before dumping a ton of money on that I would suspect the after-cat oxygen sensor is getting lazy and setting the code.

Have the O2 sensors checked and replace if needed before suspecting the catalytic converter.

Good luck.

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The check engine light is on and I brought the 2002 tundra to the dealer and they said it was the o2 sensor on the 2nd block. I would like to know the location of where it is so I could do it myself.


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I have 2002 avalanche and my engine light came on


There are a number of things that could be causing this p0420 catalyst efficiency code. The most common thing is the catalytic converter itself is no longer functioning properly. The other likely thing is the rear O2 (oxygen) sensor is no longer working properly. Other things could include exhaust leaks, damaged exhaust pipes, damaged O2 sensor wiring/connectors, plugged catalytic converter, etc.

The easiest thing to do first is a visual check of things. Visually inspect the exhaust system for leaks, check the catalytic converter for dents, holes, severe discoloration, and check for a rattle inside. If any of those symptoms are there, the converter likely needs replacement. Then, visually inspect the downstream O2 sensor (behind the converter). Check for broken wires, obvious faults, etc. If all that checks out, you'll want to check the operation of the O2 sensor. To do that, you'll need access to a scan tool or oscilloscope. Check that the waveform is pretty steady. If the reading fluctuates then the sensor is likely bad and will need to be replaced.

Good luck and hope this helps.

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2003 Lancer the service engine soon light keeps coming on, have changed out both O2 sensors and the gas cap, the code is P0421. The light comes on about 15 miles after filling up with gas


I can see that you've done the right things, but something is still amiss... Mitsubishi says

A code P0421 may mean that one or more of the following has happened:
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  • An oxygen sensor is not reading (functioning) properly
  • A sparkplug is fouled
Measure the voltage at the oxygen sensor on Bank 1 (the rear sensor, or the sensor after the converter). In fact, it would be a good idea to test each oxygen O2 sensor while you're at it.

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.

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