1996 Pontiac Sunfire Q&A
1996 Pontiac Sunfire Question: P0442, Help, fix for emmmision.
Most likely causes are: fuel filler cap is loose and need a new one due to gasket wear, fuel filler neck has rusted and there is a hole breaking the vacuum or an evap system hose is leaking. Best way to find the leak is with a "smoke test" at a shop. - csubak30
. . vm. - ziptie12