2005 Chevrolet Cobalt Logo
Posted on Feb 20, 2011
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I have had a P0420 code on my 2005 Colbalt and I have had it explained fully to me now I HOPE ( geez the first mechanic did not give me all of the details previously!!) and now I know that this code came on after the first prob with the colbalt which was a part that burned out and caused only 2 cyclinders to fire-- thus causing over rich mix fuel mixture to be dumped into the emissions chambers for a sustained period of time and now causing MAYBE prob with catalytic converter. My question is I have had an analysis of the code and the emissions lite shut has been shut off and now I have to wait to see if it comes on again? The mechanic says that mite be never again whichis a good sign, But How do I know how much damage was caused to my catalytic converter? How do I trust the lite system to come back on if it has been shut off? Will it do it and I mean not just to show I have a prob now but in the futre with anything else? I GUESS I am asking 2 questions here!!

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Well u said that i ran rich for long period of the time. there's no question that it got some damage. like he said u need to run the car until all the monitors check out. turnin the light off doesnt fix the car because is like doing a scan and if there is a problem the car computer will turn ur engine light on again. Because of the misfire the oxygen sensor and the catalytic converter may have damage this damage could been caused because to much unburnt fuel going into the catalytic converter also clogging the oxygen sensors. next time u see the check engine light or any warning light just give urself a break stop at any autoparts store they will scan the car cpu and give u advice before any damage is done.

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Copyright OBD-Codes.com

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