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2003 mazda mpv code p0421 and po431 - 2001 Mazda MPV

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

pippall
  • 1486 Answers

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

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

Posted on Jul 27, 2009

  • 1986 Answers

SOURCE: 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

Posted on Sep 18, 2009

emissionwiz
  • 75066 Answers

SOURCE: I have a 2003 MPV with trouble code PO327 and PO431

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


Posted on Sep 28, 2009

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  • 1 Answer

SOURCE: Mazda MPV 2003, Engine light on, code P0421 - warm

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.

Posted on Dec 24, 2010

  • 3640 Answers

SOURCE: 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.

Posted on Mar 17, 2012

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1 Answer

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.

Mar 04, 2014 | 1998 Toyota Corolla

1 Answer

What does the code 421 mean


the p0421 code on this vehicle is either caused by a bad catalytic converter or an oxygen sensor. your mechanic has a scan tool that he can verify if the converter is faulty by comparing the rear o2 sensor to the front sensor. If the rear o2 sensor's voltage is switching from rich to lean (01-1.0v) similar to the front's, then, it's a bad converter. The rear o2 sensor should keep a steady voltage reading. Have him do this test while at cruising speeds. good luck

Feb 28, 2014 | 2003 Mazda MPV

1 Answer

03 mazda mpv didn't pass inspection because of fault PO431?


Have the catalytic converter and your O2 sensor checked.

Apr 05, 2013 | 2003 Mazda MPV

1 Answer

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 Mazda MPV diagnostic code 421. Previously had codes PO134, PO131, PO151, PO171, PO174, PO401, & PO121. The hose the air filter and the throttle was broken, and tha engine would not start. I...


Hi


Please check the link to get a detailed idea about the code:-


http://www.obd-codes.com/p0421


Please get back to us if you have further query else please accept the suggestion.
Thank you for contacting fixya.com

Jul 07, 2011 | Mazda MPV Cars & Trucks

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

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

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

1 Answer

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


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

Jul 27, 2009 | 2003 Mazda MPV

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