Check the WSS ....specially as you are having ABS lamp as coming to a stop.

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A Dalton

How do I check the wheel speed sensor?

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93 300D 2.5 Turbo, Black/Palomino 273K
09 E350 Black/Black 41K

You can start with a DMM and spin the wheels..also ohm them for spec.
You can also pull them and see if they are full of crap and metal filings.

There is a good post about them from a few weeks ago..do a Search.

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A Dalton

Found the post. Thanks! This car has been sitting for 3 years, so it very well could be a bad sensor due to rust. I will test them wed and report my findings....

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93 300D 2.5 Turbo, Black/Palomino 273K
09 E350 Black/Black 41K

If it has sat that long, I would pull the fronts and clean them, and also do the reluctors, specially the valleys..I am sure they will be full of crap too. Then spray some brake cleamer in the sensor hole as you spin the wheel..that should clear them up...

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A Dalton

Well I took both front wheel sensors apart tonight. I cleaned the valleys in the reluctors, sprayed with brake clean, and also cleaned the sensors themselves. I put the whole rig back together and same thing. There was no pre-mature ABS intervention however.

Im telling you, this thing is weird. The ASR will kick in for no reason. It kicked in so violently tonight, it made the rear wheels screech, all while i was on neither gas, nor brake. Thats dangerous. Especially at 60mph, the speed we were going. If im off the gas, and the ASR still kicks in, is it safe to say the switch at the accel pedal is bad, telling the computer im on the gas? Can some of ASR gurus help me narrow down what I should be looking at? What can I rule out? Still saying no faults in system on all pins (1 blink).

This is really starting to pi$$ me off, since I went through the gamut of ASR issues with my 400E. Is there an easy way to completey shut off the ASR, yet keep the ABS alive?

Arthur, Im still going to try to OHM test them tomorrow. I ran out of time tonight.

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93 300D 2.5 Turbo, Black/Palomino 273K
09 E350 Black/Black 41K

Ok I ran alot of tests yesterday. I have come to the conclusion that its the front passenger side ABS sensor.

1. I ran ohm tests on all the sensors. All were in range and equal to its side-side counterpart.

2. Tested acceleration sensor @ gas pedal. Works as it should.

3. Had my gf drive the car while I AC volt tested the rear wheels. Both provided an increasing linear output as speed increased.

4. Did the same test with the front left sensor, same thing.

5. Proceeded to test the front right sensor, problem! It would increase right off the start, and then just hit a dead zone, no more rise as speed increased.


Am I safe to say this is the culprit, even though it ohm tested fine?

On the back wheels, there was a slight variation from left to right, but not much. What is the tolerance spec for side to side?

And also, why is it so hard to source a new ABS sensor for this car? Everyone is telling me its a dealer only item. Could I splice a new sensor into the wiring harness? The only difference I can tell from other W124 cars is the connector under the hood.

Thanks for all the help.

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93 300D 2.5 Turbo, Black/Palomino 273K
09 E350 Black/Black 41K