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Clifton B.
Clifton B., Auto Service Technician
Category: Chevy
Satisfied Customers: 3844
Experience:  Master Auto Tech
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I have a 2007 Chevy Impala with code PO455 Evaporative

Customer Question

HI Dave I have a 2007 Chevy Impala with code PO455 Evaporative Emissions Control System Leak Detected (gross leak)
Submitted: 1 year ago.
Category: Chevy
Expert:  Clifton B. replied 1 year ago.

hi

Expert:  Clifton B. replied 1 year ago.

did you check the gas cap ??

Expert:  Clifton B. replied 1 year ago.

this is most likely cause by a loose or bad gas cap or a leaking valnt control valve