My check engine light came on and the code reading is PO455.
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.
have the same problem?
Sunday, May 13th, 2012 AT 7:30 PM
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.