2002 Chevrolet Cavalier Q&A
2002 Chevrolet Cavalier Question: sensor P0440
440 does not identify any part that is bad. it indicates a problem with the evap system. a shop with a scan tool can check the vent solenoid, purge valve and smoke test it for leaks. there is no guessing on evap codes as it can get expensive. let a shop check it for you to verify. one common issue is the wiring harness from the body to the vent solenoid is too short and the wires pull out of the connector. Roy - mastertech6371
p0440 evap system malfuntion it is the evap purge located under rear near fuel tankeasy to find has a few hoses and an electrical connector says fails to hold sufficient vacumn.check all hoses connected to it.my haynes repair manual has some tips you can look at it check the hoses and connection - CAVALIER DEAD
Well my check engine light came on a few months ago. I've had it in to the mechanic her in California(recommended with 4.5 of 5 stars) and they did a diagnostic workup on it. The result was a P04...