Question about 2001 Mazda MPV

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Error code P0431

Need to know what this code is, error code P0431 and how to fix it

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  • George May 11, 2010

    Warm Up Catalyst Below Threshold (Bank 2)

  • Mike Tyre
    Mike Tyre Oct 11, 2013

    which is bank 2

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  • 17 Answers

P0431 Left Hand Warm-up Catalyst System Efficiency Below Threshold.

Posted on Jun 27, 2009

  • zhutchis Jun 27, 2009

    Possible front 02sensor bad.

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2006 mitsubishi endeavor has no spark at coils codes that came up were po302 and po431 was on the highway n just shut off wont start back up checked fuel pump that is good put a spark plug tester n got no...


As the code description implies the P0431 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix the problem. If the P0431 code is combined with other codes, try fixing the other codes first.
The P0302 code means that the cylinder 2 is misfiring or is randomly misfiring. Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder 2. If the problem persists more tests needs to be done to diagnose problem, see "Possible Causes"

Read more: https://www.autocodes.com/p0302_mitsubishi.html

Read more: https://www.autocodes.com/p0431_mitsubishi.html

Feb 24, 2018 | Cars & Trucks

1 Answer

P0431


Well code 431 means the computer does not think the catalytic converter is working correctly. The engine computer uses data from the O2 sensors to monitor the cat.
The actual problem could be the cat, one of the O2 sensors, a fuel problem, or other things. The O2 sensors would need to be watched with a scanner to find the issue.

Jul 17, 2013 | 2002 Mitsubishi Diamante

1 Answer

Trouble code: p0431 on 2004 hyundai santa fe 3.5L. Wondering about possible solutions


p0431 is described as "warm up catalyst efficiency below threshold (bank 2)" This code is in the exhaust system air injection section of the trouble codes. Possible it relates to an oxygen sensor reading.

Dec 29, 2012 | 2004 Hyundai Santa Fe

1 Answer

Kia p0431, p0446, p0715


They are three separate issues.
Code 431 involves the O2 sensors and the catalytic converter, code 446 is for the evap vent control for the gas tank, and code 715 is for the input shaft speed sensor in the transaxle.
The engine temp and other factors would need to be checked for code 431, and the sensors would need to be tested for the other two codes.

Aug 11, 2012 | 2002 Kia Sedona

1 Answer

Check Engine light problem. P0431 code problem. It's already being determined it's the oxygen sensor. But which one? Is it Bank 2 or Bank 1. If it's one of the Banks is it before or after the...


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.

Aug 30, 2011 | Mitsubishi Montero Cars & Trucks

1 Answer

I ran an engine analyst and got codes P0446 twice and code P0431 once. what does this mean.


P0431 Warm up catalytic converter, bank 2 - efficiency below threshold
Possible causes: Catalytic converter, wiring, HO2S 2

Usually caused by worn out catalytic converter, but always check fuel pressure regulator for proper operation before replacing a converter.


P0446 Evaporative emission (EVAP) system, vent control -circuit malfunction
Possible causes: Wiring, EVAP canister purge valve, ECM

May be caused by a loose or disconnected wire to the vent valve or possibly a bad valve solenoid

If you would like part locations, troubleshooting or replacement procedures, please let me know.

Dec 01, 2010 | 2004 Kia Sedona

1 Answer

Have a code p0431 on a passat 4motion


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.

Nov 12, 2010 | 2002 Volkswagen Passat

1 Answer

P0431 code on audi allroad 02


Typcally caused by one of the front oxygen sensors or a bad ground associated with these sensors.Replace both front sensors with direct fit type NOT universal, because there may be a cracked wire and the universal sensor does not contain the complete wire harness. Direct fits, are about $20 more than universal fit type.

The O2 sensors have integrated heating elements that bring them up to the proper operating temperature. Code P0431 indicates that the O2 sensor on your driver side catalytic converter is not reaching the proper operating range. The O2 sensors are usually in the $150 range online.

Nov 25, 2009 | 2003 Audi A6

1 Answer

I went to the emission test and I have a vw 2000 and I didnt pass couse My car has three problems and they gaved me three different codes and I dont know what they mean p1423,p0431,p1411


p1423 Secondary Air Injection Bank 1 flow too low

P0431 Warm Up Catalyst, Bank 2 Efficiency Below Threshold/Limit

P1411 Secondary air injection fault, this is related to the P1423.

Sep 29, 2009 | 2003 Volkswagen Passat

1 Answer

What are code p0342 and p0431


342 is camshaft position sensor and 431 is your catalytic converter may be getting weak. If this was my car I would do the 342 code and see if the other code for the cat comes back. Tell the shop fix the camshaft sensor. If the sensor is bad your car can still run but its possible you could set a cat code because
of it but on the other hand you cannot set a camshaft code because of a bad cat.

I am a smog tech in California

Aug 10, 2009 | 2005 Chevrolet Aveo

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