code 0442
485

Asked by Rondo May 01, 2018 at 10:07 AM about the 2003 Buick LeSabre Custom Sedan FWD

Question type: Maintenance & Repair

code  po442  low leak  gas system . can I have a picture of the gas tank s filler
neck exploded view  to see what seals are in there?

1 Answer
26,360

Jorge answered 6 years ago

Loose fuel tank filler cap is the most common cause that triggers the P0442 code. Apart from the fuel cap gasket, there are no other seals on the neck. Other causes for this code are: Missing or loose fuel cap. Incorrect fuel filler cap used. Fuel filler cap remains open or fails to close. Foreign matter caught in fuel filler cap. EVAP canister or fuel tank leaks. EVAP system hose leaking. Fuel tank leaking. Information comes from my GM shop service manual, revised September 2005. Hope this helps.

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