Question about 2001 Hyundai Sonata

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Code 0421 & 0431

My mitsubishi diamante

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P0421 - Catalyst System Efficiency below Threshold(Bank1)
bad cat

Posted on Oct 18, 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

Are parts interchangeable for 95 diamante to 97 diamante?


1995 Mitsubishi Diamante - Kelley Blue Book

www.kbb.com/mitsubishi/diamante/1995-mitsubishi-di...
Kelley Blue Book Review by Tommy - ‎Jul 29, 2015
1995 Mitsubishi Diamante overview with photos and videos. Learn more about the1995 Mitsubishi Diamante with Kelley Blue Book expert ... See all specs.

1997 Mitsubishi Diamante - Kelley Blue Book

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Oct 03, 2015 | Mitsubishi Cars & Trucks

1 Answer

What size wrench do I need to change the thermostat on a 2002 diamante


Were is the thermostat on a 2002 mitsubishi diamante 3.5 v6 ...

www.fixya.com/.../t15150678-thermostat_2002_mitsubishi_diamante_3...
Nov 26, 2012 - SOURCE: asistance to change the thermostat in a 2002 mitsubishi ....size wrench do I need to change the thermostat on a 2002 diamante.

change thermostat change thermostat - Fixya

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Aug 16, 2013 - change thermostat - Mitsubishi 2002 Diamante question. ... What size wrench do I need to change the thermostat on a 2002 diamante. May 29 ...

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Mitsubishi Diamante - Unanswered Questions, Problems & Issues. Ad ... What size wrench do I need to change the thermostat on a 2002 diamante.

May 29, 2015 | 2002 Mitsubishi Diamante

1 Answer

Where is the fuel switch on a '02 Mitsubishi diamante


all later motors are under the bonnet as far as i know ,only the first of the fuel injection cars from the early 80s were hidden in the door pilar or the boot like the old XJ jags or ford granadas ,look for a inch square red rubber topped thing under the bonnet

Aug 16, 2012 | 2002 Mitsubishi Diamante

1 Answer

I need to get my radio code for a 2000 mitsubishi diamante,someone help me please!!


contact your local mitsubishi dealer and give them the chassis number and they can supply the code

Apr 20, 2011 | 2000 Mitsubishi Diamante

1 Answer

Need radio code for 1997 mitsubishi diamante


you can get the codes from the dealer BUT you will have to remove your radio to get the radio part & security number .

Aug 16, 2010 | 1997 Mitsubishi Diamante

1 Answer

2000 Mitsubishi sedan with 6G74 V6 engine. Vacuum


I could tell you, but 1st you would need to sign up for my premium assistance plan.
The cynic in me was confirmed by your reply.
thanks anyhow

Feb 05, 2010 | 2001 Mitsubishi Diamante

1 Answer

P 0421 code when took emissions test


Either your O2 Sensor has failed, your catalytic converter has failed, or one of your spark plugs is fouled up

Sep 28, 2009 | 2003 Mitsubishi Diamante

1 Answer

1997 mitsubishi diamante stereo code


need a radio code for a 1997 mitsubishi diamante

Jul 27, 2009 | 2001 Mitsubishi Diamante

1 Answer

2003 Mazda MPV codes P0102, 0108, 0113, 0421, 0431, 0505, 0507


The codes are mass air flow sensor,manifold pressure, intake air temp, catalytic converter.

The only thing I cant think of is that the manifold seals are defective and theres no back pressure which would explain the erradic idleing.

Apr 25, 2009 | 2003 Mazda MPV

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