Question about 2002 Chevrolet Avalanche

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Service engine light stays on.Oxygen senor& IAT sensor replaced .

Light still on told I now need an EVAP vent solenoid P1665.1998 OLDS CUTLASSS.HELP!

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Hi e_lockley. The description for that P1665 code is EVAP Vent Solenoid Control Circuit Conditions. It refers to the circuit (electrical) of the solenoid.

Do a proper diagnosis, don't just replace the solenoid because the problem may also be with the wiring and connectors leading to the solenoid. Grab a repair manual and do it yourself or ask your mechanic to verify that the part has failed before replacing it.

Good luck. You may also want to read up on another P1665 case here - http://www.obd-codes.com

Posted on Feb 12, 2009

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EVAP canister vent control valve remains closed under specified driving conditions.

This solenoid valve responds to signals from the ECM. When the ECM sends an ON signal, the coil in the solenoid valve is energized. A plunger will then move to seal the canister vent. The ability to seal the vent is necessary for the on board diagnosis of other evaporative emission control system components.

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About the possible causes that your must solved:
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Your code means:

P0446 onepx.gif EVAP Canister Purge Vent Blocked

Some of the possible causes:

EVAP vent fresh air hose is clogged, kinked or restricted
EVAP Vent solenoid is contaminated, damaged or has failed
FTP sensor is out-of-calibration, damaged or "skewed"
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All tough thing for a lay person to check. You don't have to take it to the dealer, any repair garage that has the proper equipment can fix this for you.

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