It's going to the dealer on wednesday, but I thought I'd check here to see if there are any simple reasons that this may turn it's self on (Engine Management Light that is).

It came on yesterday evening about 10-15 minutes after starting from cold. Coolant temperature was normal, oil temp gauge was still low. Was driving normally down a dual carriage way 50 in 6th nothing seemed to be the matter and then it just turned on with a beep. Nursed it home.

I've started it up in Diagnostic Mode and it doesn't have any DTC information - I don't have OBD II or anything, so there may be something code I can't see.

It sounds fine when running, it has plenty of fuel/oil/coolant. It's not leaking any fluids that I can see. It's been sitting in the garage all week and hasn't been driven since last sunday (until yesterday). Is it feeling lonely and in need of attention? Anybody any ideas?