My BAS/ESP sensor light on my 2000 ML320 continues to malfunction although it has been "fixed" several times. Basically, it either lights up upon starting or sometimes it comes on while driving. Has anyone else had this problem or know of a way to reset/fix it without visiting the dealer? Thanks!

Dave

 

If it comes on right when you start it, it's probably because the steering angle sensor is losing it's calibration. You can resynchronize it by turning the wheel lock-to-lock several times. The lights should go out. If it comes only when you step on the brake pedal, it's a bad stop lamp switch.

 

I had the same problem.. Replace the brake light swith and the problem has gone away.. Does it come on when you are turning and hit a slight bump and have the brake pedal depressed.. Notice these things the next time you see it come on. If so Replace the brake light switch.

 

I recently had this problem, and unfortunatly it was my whole BAS/ESP control unit which i had to have replaced for $680 I hope yours is just the switch...

 

Does your windshield washer tank leak? The ESP unit is right underneath the washer tank, and a leaky tank drips right onto the ESP control unit. A dumb design if I ever saw one.

 

Oh my God...that really pisses me off because i do in fact have a leaky tank and the f**ks at mercedes replaced the unit and still didnt say anything about the tank causing the problem...

 

The tank leaking doesn't always cause the problem, although they should have mentioned the leaky tank. Sometimes it's just an internal failure in the ESP unit, such as a sticky ABS solenoid.