5

Tiny
ANONYMOUS
  • 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?

Sunday, February 10th, 2013 AT 6:10 PM

1 Reply

Tiny
GMTECH
  • EXPERT
  • 552 POSTS

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

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Monday, February 11th, 2013 AT 4:23 PM

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