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Model Years Affected: 2004, 2005, 2006
A loose or worn gas cap or a faulty catalytic converter are two common items which can cause Check Engine Light to illuminate.
Check engine light came on a few days ago. Got it checked and there was an error for catalyst efficiency below normal.
Q&A > Pontiac > 2004 Pontiac GTO
Common Problems > Pontiac GTO
Q&A > Pontiac > 2005 Pontiac GTO