Question about 2005 Mitsubishi Galant

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2005 (4CYL) Mitsubishi Galant. P0431

I am getting the trouble code P0431 Warm Up Catalyst Bank 2. I believe the is the bottom sensor but not sure if its the Passenger or Driver side.

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  • Anonymous Mar 16, 2014

    Im looking for the repair procedure! It says warm up catalyst bank 2

  • Anonymous Mar 27, 2014

    Engine light on showing error P0431. where is the downstream oxygen sensor on bank 2 located?

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  • Mitsubishi Master
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BANK 2 IS O2 SENSOR NEAR THE CATALYTIC CONVERTER.

Posted on Apr 29, 2010

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O2 Sensor codes are usually in the P0130- P016x range.
P0431 is Warm up catalyst efficiency bellow threshold Bank 2
Don't know what you're working with so just figure bank 1 comes off the bank with the number 1 cylinder.

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P0431 Warm Up Catalyst Efficiency Below Threshold Bank 2
The word Catalyst, means that the catalytic converter needs to be replaced because some of the warm up catalyst is not working initially when the car first starts up before it warms up.

Good luck on this repair.

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My car show me service engine sonn and the scanner say p0431 warm up catalyst efficiency below threshold (bank2) what is this?


P0431 - Warm Up Catalyst Efficiency Below Threshold (Bank 2)

Basically this means that the oxygen sensor downstream of the catalytic converter on bank 2 is detecting that the converter is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.

Symptoms: You will likely not notice any drivability problems, although there may be symptoms such as a rough/hard idle when cold.

Causes: A code P0431 may mean that one or more of the following has happened:
* The catalytic converter is no longer functioning properly
* An oxygen sensor is not reading (functioning) properly
* There is an exhaust leak

Possible Solutions: Inspect for exhaust leaks. Next step is to measure the voltage at the oxygen sensor on Bank 2. 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.

Hope helps (remember to arte and comment this).

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I believe this has to do with your catalytic converter. Sounds like it might be getting old. The older they get the slower they are to respond. this is due to contamination. Same is true for your Oxygen sensors.

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