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Failure code P0431 - Montero Sport Mitsubishi Cars & Trucks

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  • Anonymous Mar 27, 2014

    Engine light on error code P0431

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The Bank 2 after-cat O2 sensor is detecting that the cat is not working as efficiently as it should. It could be a bad catalytic converter, bad O2 sensor, or an exhaust leak.

Posted on Sep 21, 2008

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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

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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

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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

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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

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2005 (4CYL) Mitsubishi Galant. P0431


BANK 2 IS O2 SENSOR NEAR THE CATALYTIC CONVERTER.

Apr 29, 2010 | 2005 Mitsubishi Galant

2 Answers

What are codes P1492, P0421 & P0431 on the 2002 Mazda Millenia?


po421 warm up catalyst efficiency below threshhold bank 1, 431 same on bank 2..

Feb 08, 2010 | 2002 Mazda Millenia

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

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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

1 Answer

Error code P0431


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

Jun 27, 2009 | 2001 Mazda MPV

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