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Matt
Matt, Mechanical Engineer
Category: Mercedes
Satisfied Customers: 21616
Experience:  BEng hons Mech engineering, in auto industry 22 years
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I have a 1995 merc S 500 coupe. The ASR light comes on when

Customer Question

I have a 1995 merc S 500 coupe. The ASR light comes on when driving and there is a loss of power as if the break has come on to slow the car down, what to do.
Submitted: 1 year ago.
Category: Mercedes
Expert:  Matt replied 1 year ago.
Hello With ABS / ASR systems 99% of the time its a problem with one of the wheel speed sensors and I'd first check the connections at all four corners first for any signs of corrosion or chafed wiring.The sensor is located in the wheel hub so you'll have to remove each wheel in turn to inspect them all.Also check that the toothed wheel that the sensor points to is clean and free of any debris.you can check each sensor's function by plugging the two output wires into an AC voltmeter and spinning the wheel quite quickly, you should get a voltage signal that increases with rev's. Its possible that the fault is only a bad connection to one of the wheel sensors.This may be remedied by removing each wheel in turn and unplugging each sensor and cleaning the contacts with a squirt of electrical contact cleaner. Then refitting.
Expert:  Matt replied 1 year ago.
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