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P0420 code 2008 malibu - Malibu Chevrolet 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

2 Answers

My 2006 chevy malibu doesn't want to shift gears codes P0121 & P0101 & P0420 transmission place said it's not the transmission.


P0101....Mass or Volume Air Flow Circuit Range/Performance Problem
P0121 - Throttle Position Sensor/Switch A Circuit Range/Performance Problem.
P0420 - Catalyst System Low Efficiency
there is criteria that enable trans shift
solve codes problems then transmission will shift normaly

Dec 14, 2014 | 2006 Chevrolet Malibu

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In laymens terms what does catalyst system efficiency below threshold bank 1 mean?


Could either be an O2 Sensor going bad or that the Catalytic Converter needs to be replaced. There should of been a P code that goes with it. Here is a page on a similar issue: P0420 OBD II Trouble Code

May 30, 2014 | 1999 Chevrolet Malibu

1 Answer

Code p0420 2008 nissan altima


P0420: Catalyst Efficiency Below threshold. means catalytic converter is not performing to standards may need to replace cat. not sure if those guys that soak theirs even works in the long run. be sure to have any other engine running problems fixed before replacing cat to prolong its life.

Nov 03, 2012 | Cars & Trucks

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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

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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

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


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.

Aug 26, 2010 | 2003 Chevrolet Malibu

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Error coce P0420 on OB-2 scanner


P0420 = Catalyst System Efficiency Below ThresholdCatalyst System Efficiency Below Threshold. This means that the secondary O2 sensor detects that the catalytic converter isn't working as efficiently as it should. This engine code can be triggered by any one of the following:

1.) The catalyst in the catalytic converter is cracked, clogged, or otherwise damaged.
2.) The secondary O2 sensor is malfunctioning.
3.) There is an exhaust leak.
4.) The computer unit is faulty

Sep 28, 2009 | 2006 Chevrolet Malibu

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