Mechanics

CHEVROLET SILVERADO ENGINE PROBLEM

2005 Chevrolet Silverado • 103,000 miles

5.3 z engine check engine light is on code reads p0420a has poor gas milage what is the problem?
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Guest
February 10, 2013.



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

Gmtech
Feb 11, 2013.