2002 Buick Lesabre PO442 leak

2002 BUICK LESABRE
142,000 MILES • 6 CYL • 2WD • AUTOMATIC
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PEORIAMARTY
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I have a PO442 Small leak in Evaporative Emission System. How do I check cannester and purge valve? Or do I just replace both? If replacement is there a diagram to show proper removal and replacement?
Thanks
peoriamarty
Jun 23, 2010 at 10:54 AM
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RASMATAZ
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Hi peoriamarty, Welcome to 2carpros and TY for the donation

A code P0442 most likely means one or more of the following has happened:

•A loose or improperly affixed gas cap
•A non-conforming gas cap (i.e. not factory/original brand)
•A small leak/hole in a fuel vapor hose/tube
•Other small leak in EVAP system
•Faulty vent o-ring seal

Possible Solutions With a P0442, the most common repair is to:

•Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
•Otherwise, replace the gas cap, or
•Inspect the EVAP system for cuts/holes in tubes/hoses
Jun 23, 2010 at 8:25 PM