1996 Pontiac Sunfire Q&A

1996 Pontiac Sunfire Question: P0442, Help, fix for emmmision.

Change gas tank and erase OBDll, check gas filter and tank for leakers and found nothing, however, it come back -
Answer 1
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. -
Answer 2
. . vm. -