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It could be the tires if they are over size I had the same problem. It was the 6 inch wire harness that connects directly to the rear ABS speed sensor. $50 from the dealer and I rewired it. Works like a champ.

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โˆ™ 2008-02-28 17:53:43
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Q: Your 98 dodge 1500 four wheel drive with ABS why speedometer only works over 30 mph already changed sensor check engine light on code for speed sensor present?
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