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Hi, I have a 2008 Porsche Cayenne with a a CEL for P2404. The car runs completely normal and this is the only check engine light code. The only information I found on this is: P2404 Evaporative Emission System Leak Detection Pump Sense Circuit Range/Performance Possible cause of fault - Insufficient vacuum (system has a leak or blockage) - Short circuit to B+ in signal line - Leakage diagnosis pump faulty (diaphragm or reed switch sticks, internal solenoid valve stays closed or is blocked) -DME control module faulty I was wondering if there was anyone with a similar issue or anyone with knowledge of a reported fix. If not, I'm a pretty good DIYer. Does anyone know how I should go about diagnosing this?