Underhood Wiring Problems of BMW 540

I have a 2000 BMW 540i (e39). My car was in a pristine condition, and all of sudden, the "engine failsafe prog" message came up, and the car shutdown. I took it to a dealership, and I was told the thermostat was burned badly, causing the engine wiring harness and dme burned as well. I believe this is a big safety concern for those that own this vehicle. I was quoted $3500 to fix this issue, and currently it's being repaired at BMW seattle.

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While driving on the freeway, the electronic coolant thermostat shorted out and caused engine wiring harness the burn up. This caused the enigine to stop running. Luckily, burning was restricted to wires and no other components were burnt. Car is still waiting for a new wiring harness at the BMW dealer ($2000 est for repair). I have heard of similar occurances with this model car and with 740i of about the same year. This seems to be a dangerous situation and should be prevented by a fuse or fusable link.

See all problems of the 1997 BMW 540 🔎.