Question about 2002 Cadillac Deville

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Code p0420 what is fix - 2002 Cadillac Deville

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  • Anonymous Mar 20, 2014

    P0420

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What car do you have? That code generically means your catalytic converter is below efficiency. It could be the cat or (if your car is a 96 or newer), a secondary O2 sensor. The O2 sensor is a better stab in the dark as it's way cheaper to replace.

Posted on Jul 12, 2010

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Posted on Jan 02, 2017

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I have a 2005 Chevy Equinox LS that shows the problem light code P0420. How can I fix this?


Do you know what a catalytic converter is ? P0420 How To Diagnose Bad Catalytic Converter EricTheCarGuy Your best bet , take your vehicle to a qualified repair shop that knows how to diagnose this P0420 code .

Feb 03, 2017 | Chevrolet Equinox Cars & Trucks

1 Answer

My 2005 chevy equinox keeps showing problem code P0420 How do I fix this problem?


0 2 sensor near the catalytic converter or

replace the catalytic converter

The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar.

Read more at: https://www.obd-codes.com/p0420
Copyright OBD-Codes.com

https://www.obd-codes.com/p0420

Feb 03, 2017 | Cars & Trucks

2 Answers

What means catalyst Efficiency below normal


      Got it scanned and it's P0420: Catalyst efficiency below thresholdbank 1. They said it could be a bad catalytic converter or oxygen sensor. I borrowed a scanner and tried to measure the oxygen sensor readings over time.Sep 8, 2011

      civic - Check Engine code P0420 Catalyst efficiency below ...

      mechanics.stackexchange.com/.../check-engine-code-p0420-catalyst-efficie...
    Feedback

    P0420 Error Code: Catalyst System Efficiency Below ...

    www.obd-codes.com/p0420
    P0420 OBD-II Trouble Code. Technical Description. Catalyst System Efficiency Below Threshold (Bank 1). What does that mean? This diagnostic trouble code ...

    P0420 Code Fix How Its Done Catalyst Efficiency Below ...

    ? 4:25
    https://www.youtube.com/watch?v=-c8090n1Ihs
    Jun 20, 2014 - Uploaded by ACE AUTOS UK
    Here is a tutorial on P0420 code fix catalyst efficiency below threshold How To Diagnose a p0420 code ...

Jan 26, 2016 | Cars & Trucks

2 Answers

What does trouble code p0420


p420 code has to do with your exhaust system,catylic converters,..sensors...could be a simple fix or not...

Sep 19, 2014 | 2003 Chrysler Town & Country

1 Answer

P0420 code evap system


This is not an evap code. Read on:
P0420 - Catalyst System Efficiency Below Threshold Bank 1

Possible causes- Three way catalyst converter Bank 1
- Exhaust tube
- Intake air leaks
- Fuel injectors may be faulty
- Fuel injector leaks
- Spark plugs may be faulty
- Improper ignition timing
- Engine Control Module (ECM)
Tech notes The most common cause it the three way catalyst converter Bank 1. Changing just the O2 sensor usually don't repair the problem. If the P0420 code is combined with other codes, try fixing the other codes first.

Nov 02, 2012 | Cars & Trucks

1 Answer

2002 Nissan Altima P0720, P1574, P0420


I have a 2002 Nissan Altima. Can anyone tell me what these codes are? And how to fix them? P0420

Apr 02, 2010 | 2002 Nissan Altima

1 Answer

Fault codes p0420&p1406


catylist efficiency below threshold ( p0420 ). heres a probable fix. go to http://repairpal.com/obd-code-p0420----- this will tell what may be wrong as not to replace parts that are not bad.

Feb 17, 2010 | 1996 Chevrolet C2500

2 Answers

Trouble shooting P0420 code, bank 1, OBD II for 2000'?


misfiring can cause a P0420 code.
I would recommend a set of honda plug wires and plugs if the P0420 code returns.
I have used bolt in aftermarket bolt in catalytic converters but don't remember the brand name they fit ok and i have had 1 or 2 return with a P0420 code out of about 20. I have never replaced the oxygen sensor on a civic like yours.
I always fix the misfire problems, reset the computer, and have the customer drive it and see if the code p0420 returns. 50% don't have the P420 code return. drive it and see what happens and go from there.

Jan 06, 2009 | 2000 Honda Civic

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