The ABS light is not on, however through the use of a multi-meter, both rear and left front ABS sensor outputs are relatively the same for a given speed. The right front one is the oddball, producing almost zero output. Why it isnt triggering the ABS light instead of seeing it as a locked up wheel is beyond me...

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

The main factor for sensor output is spacing, so you have worn down reluctor teeth or a bad sensor.

A scope is nice when you do these b/c then you then see what the Module is actually seeing [ which is why I posted the article]
An ohm value only tells you the sensors coil ohmage for shorts or open circuit and a volt reading tells the Average amplitude. But a scope will tell you every single sine wave chacrteristic of every reluctor hall effect on the sensor. That is what you want to know.
I suspect reluctor height has deminished, just from wear and road rash/ruct. But do not over-look a possible bad sensor...Does the new one match up measurment-wise w/the old one.

Also check that the wheel bearings are not loose..

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A Dalton

Arthur,

Thanks for the advice. I agree a scope would be key. I nor my independant have access to one at this point. I did not put the old sensor next to the new one to compare. They looked the same to me, but that might be in order.

I redid the wheel bearings earlier this week before I put the new sensor in. They are nice and tight with new grease.

A local salvage yard is sening me a good used hub today that im going to put on. It was relatively inexpensive ($36) and hopefully will put an end to this madness. If that doesnt solve it, then my ideas are exhausted.

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

FIXED!!!

The new (good used) hub fixed the problem. Turns out the corrosion did knock some height off the reluctors.

Thanks too all that helped, especially Arthur and DOC.

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

Thanks for posting a fix - I hate it when threads like this get really good and detailed and then just ... fall flat. Nice to see a resolution.

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280

I've often thought about a scope. Can one be had inexpensively? Perhaps used? Any links to an example?

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280

Best one is an LS2000..they are DSO and user friendly..and altho they origianally were around $2 grand, you see them on ebay all the time for a couple hundred. Try and find one that also comes with the ign pick-up.
That scope will pick up anything on automotive systems.
Unfortunately, the days of diagnosing with a DMM and a test lamp are disappearing b/c of the technology and a DSO is now just commonplace in any shop. But the upside is now you can buy one for cheap..and once you own one , you will wonder how the hell you got by w/o it.
You can look at any sensor and diagnose it in 30 secs w/o that " WONDER if 'dis is gonna' work " feeling you get as you buy an expensive part ..so, it pays for itself.
I see many post here where the poster says his Mechanic does not have a scope...RUN...that puts him in the same boat you are in...Guessing.

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A Dalton