1999 Buick Lesabre Repair Question
1999 Buick Lesabre P0440
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?
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
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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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