Check Gas Cap p0440 - Try This First
While working on a 2000 SSEi with this code, and checking all the usual problems, I recalled what DaveSSEi found in this thread.
Checking the line from the evap solenoid to the canister (the smaller line with the white end), it was attached properly and the clip was holding as it should. I gave it a push, and heard the same click that Dave found. There has not been any recent work done in that area. I took the connection off, cleaned things up and put a dab of silicone grease on. The code has not returned. Anyone experiencing this code may want to check there first.
Edit - That is after being certain the gas cap is on properly, and the top of the filler tube is clean.
Black 2000 SSEi, Silverstar Headlights, Angel Eyes fogs, 3rd brake light overlay, hi-flo cat, drilled 180 degree thermostat, Intense FWI, PCM, shift kit, and 3.4 Pulley. Solid front mount.