Intermittent false warning lights?

Has the alternator output and battery condition been checked? Also make sure all earth cables/connections are in good condition.

crank
April 2010

I just guess - I know nothing of motor vehicle electrics...

The warning lights in the car will probably be driven from a microprocessor running a small s/w programme. It may be possible that the s/w has a bug in it but the symptoms you report are not consistent with a s/w problem - too many things failing and - if it was a s/w issue - then other cars would also suffer and the manufacturer and the dealer would know about it.

Electronic components generally fail or work - they usually only behave intermittently when there's a poor connection. Continuing the guessing game your car may well have a poor or loose connection in the area of the small computer that runs the warning lights and dashboard etc - the vibration of motion makes the fault come and go - I would suspect a defective connector plug/socket or a dry joint. Very probably in the dashboard cluster circuit board.

Tapping with a wooden spoon in an attempt to bring the fault on may help diagnosis.

Good luck...

Peccavi
April 2010