My check engine light came on and the code reading is PO455.

Tiny
PAULINEHILL
  • MEMBER
  • 2007 CHEVROLET IMPALA
It started out with a bad gas cap. Went to auto zone and they sold me the wrong cap that wasnt pressurized. I drove for 3 weeks like that. Put the right cap on and my code hasnt reset and now it states tha its gross evaporitive system leak.
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Sunday, May 13th, 2012 AT 7:30 PM

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Tiny
ASEMASTER6371
  • EXPERT
Most likely the gas cap was not the issue. You need a shop with a scan tool, smoke machine and voltmeter to determine the failure and tell you the exact failure.

Roy
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Sunday, May 13th, 2012 AT 7:47 PM

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