P0431 OBD Code Definition:
P0431 Warm Up Catalyst Efficiency Below Threshold Bank 2
P0431 OBD Code Description:

OBD Code P0431

Warm Up Catalyst Efficiency Below Threshold

What’s mean?

OBD2 Code P0431 Definition:
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.


Possible sumptoms of P0431
You will likely not notice any drivability problems, although there may be symptoms such as a rough/hard idle when cold.

Possible Causes

Possible causes of P0431
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.

OBD-II Codes

P0420 P0421 P0422 P0423 P0424 P0425 P0426 P0427 P0428 P0429 P0430 P0432 P0433 P0434 P0435 P0436 P0437 P0438 P0439

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