Question about 2003 Isuzu Rodeo

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Engine code p0420 p0430

Engine code p042 p0430

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Catalytic converter issue

Posted on Mar 29, 2014

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Posted on Jan 02, 2017

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Car sometimes will not start after sits for a day


Definition of Diagnostic Trouble Code P0420 Category: Powertrain Definition: Catalyst System Efficiency Below Threshold Bank 1Note: This definition of P0420 is applied to all manufacturers

Definition of Diagnostic Trouble Code P0430 Category: Powertrain Definition: Catalyst System Efficiency Below Threshold Bank 2Note: This definition of P0430 is applied to all manufacturers

As the code description implies the P0430 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. If the P0430 code is combined with other codes, try fixing the other codes first.

Jul 11, 2015 | 2006 Toyota Solara

1 Answer

Volkswagen touareg 2005, V6, 3.2L error code P0420, P0430 and P0068


Hi. Please concentrate on fixing p0068. this is to do with airflow and fuel/ mixture. maybe air mass meter. these can cause faults p0420 and 0430 to come on. after p0068 is repaired clear all faults and take the car on a long drive to clean out the cats, reassess if the cats are actually faulty at a later date.

Mar 04, 2014 | Volkswagen Cars & Trucks

2 Answers

My 1999 Chev Tahoe will not start - Has codes p0430 and p0420


Hi Charlie,
Diagnostic Test Codes (DTCs) P0420 and P0430 ar "Catalyst Efficiency" codes. These simply mean that the catalytic converters in your vehicle are not performing the way they should be. To fix these codes, you will most likely have to replace the converters. However, these codes do NOT indicate why your engine wil not start. There are many things that can cause an engine to not start. Many of which may or may not set fault codes. You need to determine if the engine is getting fuel and ignition first then go from there.

Dec 17, 2011 | 1999 Chevrolet Silverado 1500

1 Answer

2006 Ford F150, 4x4, Triton V8, 5.4L-loses power going uphill between 50-60mph. Check engine light code of P0430. This indicates exhaust system. Where to start?


code P0420 & P0430 usually indicates a problem with catalitic coverter restriced/clogged
a muffler shop can run a test to check this .a misfire in engine can also be a culprit of coverter
going bad because of unburned fuel going through exhaust system

good luck

Jun 19, 2011 | Ford F-150 Cars & Trucks

1 Answer

Getting OBD codes p0420 and p0430, how to fix these issue with my 2001 Audi A6


2001 Audi A6
EOBD code: P0420
Fault location: Catalytic converter system, bank 1 - efficiency below threshold
Probable cause: Catalytic converter, wiring, heated oxygen sensor 2 (downstream)

EOBD code: P0430
Fault location: Catalytic converter system, bank 2 - efficiency below threshold
Probable cause: Catalytic converter, wiring, heated oxygen sensor 2 (downstream)

Sep 14, 2010 | 2001 Audi A6

1 Answer

Ck. Engine P0420 & P0430


engine code p0430 for 2005 toyota sienna

Nov 25, 2009 | Toyota RAV4 Cars & Trucks

2 Answers

P0420 & P0430 codes 99 silverado


codes p0420 and p0430 are both post o2 sensors, the ones after the convertor, both sides if replacing

May 17, 2009 | 1999 Chevrolet Silverado 1500

3 Answers

P0420 and P0430


P0420 and P0430 are codes related to the catalytic converter effeciency. The catalyst will need to be replaced $$.

May 19, 2008 | 2000 Nissan Maxima

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