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Which catalystic converter should I focus on if my Mazda millenia has a p0431 code

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  • Cars & Trucks Master
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The front seems to be most likely ..there really is no inexpensive formula other than being safe and replacing both converters ..God Bless

Posted on Oct 17, 2013

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: cat converters

yes sir they are about right. I have had both of my CAT CONV replaced. The 1st was under warranty. There is a 8yr/80000, mile warranty with the dealer. So I did not have to pay anything for that. The second one was replaced recently at Precision Tune. That was a bout a grand just for the CAT CONV and labor. I had called the mazda dealer and they confirmed as well. So yes we do have two and they do cost about a grand a piece.

goodl luck

Posted on Nov 24, 2008

  • 21 Answers

SOURCE: 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.

Posted on May 30, 2009

  • 645 Answers

SOURCE: What are codes P1492, P0421 & P0431 on the

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

Posted on Feb 08, 2010

  • 14036 Answers

SOURCE: 2005 (4CYL) Mitsubishi Galant. P0431

BANK 2 IS O2 SENSOR NEAR THE CATALYTIC CONVERTER.

Posted on Apr 29, 2010

tunde007
  • 2382 Answers

SOURCE: Po431 code came up as

Hi, 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.

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.

Posted on Jan 20, 2011

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1 Answer

P0431 code came out


exhaust leak,or bad sensor,even the converter,
look for an exhaust leak first then the sensor next lastly the converter.My bet is on a exhaust leak,even a stuck EGR valve might need cleaning because it shows up as a leak as well.Good luck,Gary

Oct 24, 2013 | 1999 Mazda Millenia

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

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

3 Answers

I have a 2003 MPV with trouble code PO327 and PO431. What do these mean? Thank you.


P0327 Knock Sensor 1 Circuit Low Bank 1 or Single Sensor
P0431 Warm Up Catalyst Efficiency Below Threshold Bank 2


Sep 28, 2009 | 2003 Mazda MPV

1 Answer

Error code P0431


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

Jun 27, 2009 | 2001 Mazda MPV

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

1998 Mazda Millenia check engine light


catalyst system efficiency below threshold(cylinder bank no.1).

Jan 16, 2009 | 1998 Mazda Millenia

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