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Every time I close the hood on my '05 convertible the check engine light comes on. It clears by itself after driving for a while. Any thoughts on what connector is loose? This also happens occasionally when I wash it.
I believe that the hood openings and closings are monitored as part of the adjustment of the service interval.
The first thing I would look at is the switch/sensor in the bonnet hinge. I bet it is bad, particularly if this also happens when the car is washed.
The light clears because it is no longer getting the fault. You might try putting a code reader on after you open and close the hood and before you drive. There may be a fault code. You have to read it before it clears.
Good luck chasing electrical gremlins...
__________________ "Sparky"; PS '03 MCS; Premium & C/W Packages; OEM Roofrack; Xenons; 17" S-Lites w/Goodyear Eagle F1 AS; S/B Bonnet Stripes; Union Jack Moonroof & mirrors; K&N Typhoon CAI w/box; Alta 15%, SC Diverter,& 19mm Rear Sway Bar; NGK Iridium plugs, MSD wires, CravenSpeed Defenders; M7 Air Diverter; Euro Shelf; AUX Cable; BlackSheepskin Vest Covers; St. Martin license plate; RMW tune; Dyno'd @ 199.7 hp
I thought codes remain even if the light clears. I know this is the case on my wife's 2001 VW.
This is true.
Possibility #1 - There is a wire harness that crosses the radiator shroud right under the rubber seal. Look to see wheather the connector on the T-MAP harness has any rub damage ( it's the sensor on the front of the intake manifold ).
__________________ 2003 S, IB/ W, no HK sound, leather or power seats but everything else.
"Sparky"; PS '03 MCS; Premium & C/W Packages; OEM Roofrack; Xenons; 17" S-Lites w/Goodyear Eagle F1 AS; S/B Bonnet Stripes; Union Jack Moonroof & mirrors; K&N Typhoon CAI w/box; Alta 15%, SC Diverter,& 19mm Rear Sway Bar; NGK Iridium plugs, MSD wires, CravenSpeed Defenders; M7 Air Diverter; Euro Shelf; AUX Cable; BlackSheepskin Vest Covers; St. Martin license plate; RMW tune; Dyno'd @ 199.7 hp
Cristo .... and his trusty BRG/BRG MC Bliksem 
2003 S, IB/ W, no HK sound, leather or power seats but everything else.
