Question about 2001 Mitsubishi Montero

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Check engine light does not work and i have 3 problem codes p0431 p0421 p0455

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  • Anonymous Mar 21, 2014

    P0421 & p0431

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When you first turn the ignition key on all the working lights will come,if its not working could be a bulb in the dash.if its working maybe the codes are old and stored in there because no one erased them.

Posted on Jan 17, 2010

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Code p0455 on envoy 2004


large evap leak --check gas cap that it is on --look under truck at rear of fuel tank by spare tire and check the evap canister and hoses the following link will assist you
https://www.obd-codes.com/p0455 How to Fix Check Engine Light P0455 Emissions Purge Valve Replacement How to Fix Check Engine Light P0455 Emissions Purge Valve Replacement

Sep 19, 2016 | Cars & Trucks

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

2 Answers

SERVICE ENGINE SOON LIGHT CAME ON READS CODE P0431 AND P0421


Converter is not working as efficiently in Bank 1 and Bank 2 (two codes)...

P0421 - Warm Up Catalyst Efficiency Below Threshold (Bank 1)
Basically this means that the oxygen sensor downstream of the catalytic converter on bank 1 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. The code may be more likely to occur after the engine has had numerous cold starts in the past 1-2 days.

Causes: A code P0421 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
A sparkplug is fouled up

Possible Solutions:
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.

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 this helps.

May 05, 2011 | 2004 Mitsubishi Endeavor

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

How to fix daignostic codes p0304, p0421 and p0455 efficiently without costing an arm and a leg.


P0304 is Misfire in cyl# 4. Check your ignition system and fuel system.

P0421 is Catilist effeciency. Fix P0304, if P0421 returns you will need a catalitic converter

P0455 is an Evaportive emission leak. Be sure you gas cap is tight and secure. If it is ok, then there is a leak in the system.

Aug 06, 2009 | 2001 Mitsubishi Eclipse

1 Answer

P0421, P0431


Technically, you can put the car in neutral and press the gas while the car is running, til it reaches 3500 rpm. You don't have to actually have the car on the road while you do this.

Apr 06, 2009 | 1999 Mazda Millenia

1 Answer

Codes p0421 and p0431


Check for air leak on vacuum hoses, and exhaust plus test health of O2 sensors b4 doing the CAT b/c CAT are the most expensive.

Nov 26, 2008 | 2003 Audi A6

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