1999 Buick Lesabre



November, 29, 2008 AT 7:31 PM

Engine Mechanical problem
1999 Buick Lesabre 6 cyl Front Wheel Drive Automatic 128000 miles

My check engine light came on. I just changed my plugs and wires and the light turned off. Now it is on and the scanner gives a reading that says: P0440 EVAP Control System Malfunction. What does this mean?


2 Answers



November, 29, 2008 AT 7:51 PM

A code P0440 could mean one or more of the following has happened: The gas cap is not installed or working properly
The purge solenoid has failed
The canister is plugged and not working properly
Possible SolutionsWith a P0440 OBD-II trouble code, diagnosis can be tricky at times. Here are some things to try: Remove and reinstall the gas cap, clear the code, and drive for a day and see if the codes come back.
Inspect the EVAP system for cuts/holes in tubes/hoses
Inspect for damaged or disconnected hoses around the Evap purge solenoid
Check and/or replace the sensor
Check and/or replace the purge valve
Have a professional use a smoke machine to detect leaks



December, 1, 2008 AT 8:41 AM

Thanks for the feedback.I will do the gas cap deal today. But if that doesn't work how do I find all those other things you talked about.

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