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2005 Chevy Cobalt Emissions

Tiny
FKNUT2002
  • MEMBER
  • 2005 CHEVROLET COBALT
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 35,000 MILES
Just failed emissions test. They gave me codes p0420 and p0455. I did how every drive for a while without a gas cap on (a few months). I recently replaced it, could that be the cause for both failures?
Thursday, June 4th, 2009 AT 2:36 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Yes, it could. Keep in mind, the vehicle has a 5 year 50K emissions warranty from the manufacturer. They will repair or replace any emissions component that fails 100% during that time period. I believe your car falls under that at this time.
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Thursday, July 9th, 2009 AT 10:12 PM

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