Hi Jim,

The car wasn't in test mode when i discovered the light wasn't working, although I have disconnected the battery since to see if the ecu would reset.

I have read that if the bulb has gone, this also disables the 4matic, but not sure if this is correct.

My OVP seems fine, but was wondering if my slow speed break pedal stutter which is an ABS fault could be being caused by a duff OVP, which in turn is not giving any power to the 4matic ecu?

Justin