Question about 2003 Mazda MPV

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Mazda mpv 2003 check engene light code p0421 warm up catalist ...

Catalitic was replased in bank1 and bank2 a month ago what can be now.

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Replace the air flow meter has this sounds like your problem.Good luck.

Posted on Jul 27, 2009

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2003 ES. What are the probable causes of DTCs P0421 and P0431?


code p 0421 refers to warm up cat converter bank 1--efficiency below threshold ===causes ---cat converter---wiring---HO2S 2
( heated oxygen sensor)
code p 0431 refers to warm up cat conveter bank 2--efficiency below threshold === causes cat converter --- wiring---HO2S 2
as the same HO2S appears in the cause of the fault I would be inclined to change it first
the HO2sS sensor is the one in the exhaust manifold or before the cat converter
and 2 is in the front bank of a V engine
use the special socket when removing/ replacing these sensors as an incorrect tool is the main reason for wire failures on the sensors

Dec 17, 2015 | 2003 Mazda MPV

1 Answer

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 kia sedona lx didnt pass smog code p0421


P0421 Warm Up Catalyst Efficiency Below Threshold (Bank 1)
____________-
Can Clip Renault

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My fan on my 2003 mazda mpv starts running as soon as i turn on the ignition. could this cause erractic codes


the temperature cooling sensor, The sensor's output is monitored by the engine computer to regulate various ignition, fuel and emission control functions, and to turn the radiator-cooling fan on and off as needed. check this first ! also check the fan relay in relay box. it may be sticking in the on position. hard to say without being there. but try the above things. good-day ! the fans come on if a/c is on.

Mar 17, 2012 | 2003 Mazda MPV

1 Answer

2003 mitsubishi eclipse code p0421 warm up catalist bank 1


catylitic converter has issues--if your state has inspections then get it tested

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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:
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  • An oxygen sensor is not reading (functioning) properly
  • A sparkplug is fouled up
Possible Solutions

Feb 27, 2011 | 2003 Mitsubishi Lancer

1 Answer

Mazda MPV 2003, Engine light on, code P0421 - warm up catalyst efficiency below threshold bank 1


could anyone please help me with this problem that i have with my 2001 mazda protege es 2.0. i have a bad catalyst converter and im waiting for the converter to come in, but before the guys that are fixing on my car relize that i need a converter they put a egr valve and a o2 senor and when the car idle some time it will just die one me. could someone tell me what is going on.

Nov 30, 2010 | 2003 Mazda MPV

1 Answer

Hi, I have Mazda MPV 2003 (99 Kmiles). Several


did you check your transmission fluid

Mar 27, 2010 | 2003 Mazda MPV

2 Answers

I am getting a P0031, P1512, & P0421 code


P0031 - most likely pointing to a failed O2 sensor (bank 1 sensor 1 is located before the catalytic converter)

P0421 - failed catalytic converter or a failed O2 sensor

P1512 - intake manifold shutter valve is stuck - may be caused by the O2 sensor, but may not

I recommend replacing your O2 sensor first and see what happens

Sep 18, 2009 | 2001 Mazda MPV

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