Hi,
I have a 1997 s420 and I have an asr light when I start the car. It does not matter if it is cold or hot. I used a CEN TECH scanner to pull code. It comes up with P1580 which is throttle actuator otherwise known as throttle body. It does not tell me that it is bad. It simply says throttle actuator. Could there be anything to check before I replace this unit. It is quite expensive ($1500) and I can't return it. Would a mercedes benz dealer agree to check unit if I took it to them after I take it out of the car. I already checked the unit's electrical wires and they seem to be fine. I took the unit off the engine and still had it plugged into th harness. I sat the unit by the winshield wippers where I can still see it while I seat behind the wheel. I turned the key into position 2 but not crancking the motor. The butterfly inside the throttle body opens wide and stays like that. is that normal? Has anyone tried this before? What should I expect from a working ETA?
Any help is appreciated.