The vapor escapes through a vent in the gas tank cap to a charcoal filled canister called the evaporative emissions canister. The charcoal absorbs the gasoline. Under certain pressure and temperature conditions, the vehicle’s computer sends a signal to open the vapor purge solenoid, sometimes called the vapor vent solenoid. Vacuum from the ... The leak was the o-ring in the canister end fitting on the tank-to-canister pipe. I was chasing a P0445 "large leak" code. From that pipe the tank holds vacuum, and the engine side holds vacuum when I put a cap on that port.
Got the code from the shop today: P0456 - emissions control, very small leak. Did a search of the internets and turned up somebody else that had a problem with the charcoal canister valve. Code 85 - CANP solenoid - The Carbon Canister solenoid is inoperative or missing. Check vacuum lines for leaks and cracks. Check electrical wiring for loose connections, damaged wiring and insulation. Check solenoid valve operation by grounding the gray/yellow wire to the solenoid and blowing through it.
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