Advice for P0420 and other codes - Chevy Cobalt SS Forum : Chevrolet Cobalt SS Forums
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post #1 of 2 (permalink) Old 03-09-2016, 10:43 PM Thread Starter
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Location: Sapupla,OK
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Advice for P0420 and other codes

Hello first time cobalt owner its an 06 cobalt ss sc, has close to 142k, and only mod is injen intake. So recently it has threw the P0420 which I seen it would most likely be a bad cat? Also threw a P0103 for MAF, P0171 fuel trim system?, and a P0300. Are these related to a P0420 or all seperate issues of there own? Just need some advice on where to start as I am new to chevys and thank you in advance!
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post #2 of 2 (permalink) Old 02-16-2018, 10:47 AM
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i have the same intake as you and getting a p0420 as well.. my afm is all over the place as well.. just bought the car and trying to find whats aftermarket on it still
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