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Error code p0421 - 2002 Mitsubishi Lancer

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Taken from: http://forums.evolutionm.net/lancer-troubleshooting/349095-code-p0421-call-mitsu-before-you-do-anything.html

Code P0421- Call Mitsu before you do anything!
Icalled my nearest dealership today and for those who dont know, if yourcheck engine light is on and its showing fault code P0421 this may befrom a factory recall on the warm-up converter and a PCM reflash.MILEAGE OF THE CAR DOES NOT EFFECT THIS RECALL. Anyone whos had problemwith a dealership not doing the repairs because of mileage needs tocontact another dealer or the owner of the dealership. This is what theservice manager told me today so though I'd share. Getting mine fixedtomorrow at 10am, I cant wait.

For more information about this code Google "Fault Code P0421" You'll get tons of information Last edited by Swankzer; Jun 2, 2008 at 12:31 PM.

Posted on Jan 04, 2010

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SOURCE: NEED TO KNOW WHAT IS THI P0421 ERROR CODE

PO421:Warm Up Catalyst-below threshold (bank #1) CEL

Posted on Nov 30, 2009

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1 Answer

Is it possible to get a P0421 code from the OBD computer when the engine light is not on?


Yes it is and it would mean that the problem that caused the P0421 has either been corrected or is intermittent and is no longer in the state causing the failure. P0421 is a code for Warmup Catalyst Efficiency so there. Like be an intermittent problem with an O2 sensor or the catalytic converter may be starting to clog.

May 06, 2014 | Mitsubishi Galant Cars & Trucks

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P0421 CODES AND C1201


C1201 error code means that you have some problem in engine control system.

Possible causes for P0421 error
  • Warm Up Three Way Catalytic converter deterioration or malfunction
  • Exhaust system leaks
  • Loose front or rear HO2Ss
  • Faulty front heater O2 sensor
  • O2 sensors harness is open or shorted
  • O2 sensors poor electrical connection

The P0421 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.

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2002 mazda mpv sputtering


Error Code: P0421
Description:
Warm Up Catalytic Converter, Bank 1 - Efficiency Below Threshold
Possible Cause:
Warm Up Catalyst Bank 1 faulty.
Possible Solutions:
Check Warm Up Catalyst Bank 1 - Set Readiness.
Replace Warm Up Catalyst Bank 1.

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2003 mitsubishi lancer will not pass smog code P0421 comes up what is this.


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

Feb 27, 2011 | 2003 Mitsubishi Lancer

1 Answer

Error code P0421 how to fix it. which o2 sensor gets replaced?


P0421: Warm Up Catalyst Efficiency Below Threshold (Bank 1).

This could apear because of a bad O2 sensor on the catalytic converter on bank 1.

Or The catalytic converter is no longer functioning properly.

Hope this helps you. Good luck bro

Jan 09, 2011 | 2002 Hyundai Santa Fe

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How do i fix 1999 Mazda 646 check engine error code P0421?


Code - P0421 text as follows:

WARM UP CATALYST BELOW THRESHOLD - BANK 1
usually this is caused be poor spark wires or plugs. If the ignition system is in poor condition or recently repaired because of misfire it could indicate that the front converter is now burnt up and requires replacement.
First pls check if ur car needs a tune up? if not done since long (3yrs/60K miles), do the tune up and see if it helps. or else u will need to do as explained above.

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my 2001 mazda 626 V-6 have a error code p0421 & P0421 so how do i fix it. tell me the causes and the solution

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NEED TO KNOW WHAT IS THI P0421 ERROR CODE


PO421:Warm Up Catalyst-below threshold (bank #1) CEL

Nov 30, 2009 | 2003 Mitsubishi Lancer

2 Answers

What is it


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


How to...

Hope helped (remember rated this help) Good luck.


Nov 09, 2009 | Mitsubishi Cars & Trucks

1 Answer

P0421 code on recently purchased(from dealer) 2002 RS


Hi,

So you have a P0421.

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

As far as running conditions if it performs normally, you most likely need a catalytic converter. The good part of this is there shouldn't be any abnormal running conditions, so it should be fine unless the engine is running very rich for some reason. (it will usually smell badly when this happens) However, on rare occasions the cat can get hot and melt down causing an exhaust restriction..bad gas mileage, low power, and possible fire potential, but most likely this is not the case. (this is generally speaking here and covering all the bases... )

The most common thing with P0421 that the fuel injection computer detects that the cat is not performing to federal specs an need to be replaced. You will need to have it fixed before your vehicle inspection.
Good luck and I hoped this helped you.

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