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 Answer

  • Tiny
  • gmtech
  • Expert
  • 553 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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