5

2005 Chevrolet Silverado

Tiny

Anonymous

February, 10, 2013 AT 6:10 PM

5.3 z engine check engine light is on code reads p0420a has poor gas milage what is the problem?

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1 Answer

Tiny

gmtech

February, 11, 2013 AT 4:23 PM

It could be an oxygen sensor or the catalytic convertor acting up

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