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2010 GT3, i was driving with close to empty gas tank on the way to gas station, then run into a moderate "dip" on the road. Then the engine light out and i ran the code and given P2402 upper limite value exceeded. i tried the new gas lid trick, it doesnt work. any idea?
Replace the leak detection pump as a first step. Could also be the canister, or a leak, but the most common failure point is the pump. They aren’t too $. It’s in the frunk area, under the cowl. If thats not it you might have to have the system leak tested. See page 201-30 in the PET. Part 11. 99760512501
On the 997 GT3, the evap vent goes into the oil tank IIRC, there is a check valve back there. On other cars like the carrera and turbo there is a solenoid. GT3 doesn’t have that.