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05 Chevy Malibu P0420 code has set the check engine light.

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Hi. P0420 is a catalyst efficiency code. 100% of the time you need a new catalytic converter. If you want to be sure it is the cat pull the O2 sensor before the cat and drive it, the sluggishness will go away because there is no more restriction.

Posted on Aug 26, 2010

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Posted on Jan 02, 2017

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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

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I put a catalyic converter and a downstream o2 semsor on my 2002 chevy malibu a year later i get the p0420 code what is going on


Your converter may be failing again, and this can be caused by coolant leaking into combution chamber (bad head gasket), worn engine parts such as rings, or using certain additives in the fuel.

Feb 26, 2015 | 2002 Chevrolet Malibu

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I have a 05 chevy malibu and my check engine light and mt tc light came on my cruise doesnt work now i was able to make it home which was 80 miles and solutions??


You need to scan the vehicle's computer and retrieve codes. It is very hard to give any advise based in the light is on. Are there any symptoms?

Jun 20, 2012 | 2005 Chevrolet Malibu

1 Answer

I have a 1999 chevy malibu its 6 cylinders 3100 engine and i have the codes with me this aare the codes that i need 1.#p0420 2.#p0410 3.#p0305 4.#p0449


P0420 - Catalyst System Low Efficiency
P0410 - Secondary Air Injection (AIR) System
P0305 - Cylinder 5 Misfire Detected
P0449 - Evaporative Emission (EVAP) Vent Solenoid Control Circuit

Sep 05, 2011 | 1999 Chevrolet Malibu

1 Answer

2006 chevy cobalt(85000 miles) check engine light comes on and stays on. I am getting the check engine light code p0420. Engine seems to be running smoothly.


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

TSB Number: 3316 NHTSA Number: 10017210 TSB Date: n/a Date Added to File: October 27, 2005 Failing Component:Electrical System Summary:Diagnostic trouble code P0420 may set on low mileage vehicles, or shortly after catalytic converter replacement
TSB Number: 3316 NHTSA Number: 10017210 TSB Date: n/a Date Added to File: October 27, 2005 Failing Component:Electrical System Summary:Diagnostic trouble code P0420 may set on low mileage vehicles, or shortly after catalytic converter replacement
there is a service bulletin for this.

http://www-odi.nhtsa.dot.gov/cars/problems/tsb/results.cfm?start=1&SearchType=DrillDown&type=VEHICLE&year=2005&make=CHEVROLET&model=COBALT&vehtype=PC&typenum=1&component_id=0&summary=true

Aug 02, 2011 | 2006 Chevrolet Cobalt

2 Answers

The engine warning light on my 2008 malibu is on. I also have had problems with the acceleration of the vehicle. My local mechanic ran an emissions check and showed a defective catalitic convertor. I...


That car sounds like it has too many problems.
If it were me, I would not waste anymore money and time
on it and find another vehicle if possible.

May 11, 2017 | 2008 Chevrolet Malibu

1 Answer

Chevy malibu check engine light on code P1665 what


P1665 Evap vent solenoid control circuit

Aug 30, 2009 | 1999 Chevrolet Malibu

2 Answers

Chevy Blazer P0303 and P0420


Most probably and if a cat is not flowing proper is causes back preasure that can result in sticking or burned vavles,mechanic not nice by saying ignore the cat effiency code p0420.Can ussually have cat replaced at aftermarket muffler shop for approx. $200 cheaper than valve job or excessive fuel that you have used and damage that may occur to your engine.

Jun 16, 2009 | 1999 Chevrolet Blazer

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