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I'm having the same problem with my '99 Ram van. After reading this and other forum threads I'm convinced this is the problem. Last night I crawled under the beast, unplugged the ABS sensor and measured the electrical resistance. I've heard that it ought to measure around 1800-2400 ohms. Mine measured as an open circuit.
I tried to buy the sensor at Kragen, Auto Zone and NAPA today and nobody had what I think is the right part. Auto Zone had something they called a speed sensor, but it is a plastic unit with 1" threads that would screw into the differential housing for $12.95. I'm almost sure this is not the right part. If my information is correct the right part is held in by a stud and nut and just slides out (no threads) after you undo the nut. The only problem is I can't find it anywhere in an A/P store or on the net. My friendly Dodge dealership would gladly take $86 for an exact replacement, but I'd like to save a little in the process. Does anyone know where I can order an ABS speed sensor online? Can anyone verify what the electrical resistance should measure? My Hanes repair manual is not specific, but says the pre '92 sensor should measure under 2400 ohms.
Jay: If you read this can you help me find the web site you ordered from? Was your's threaded or did it slide out?
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