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may be the speed sensor/on the rear diff.

controls abs+speedo on later models/mine was on for about 6 mos before the speedo went lame/replacement fixed both

2000 Mazda B-3000. Problem: ABS light went on, then Check Engine light. Speedometer not functioning until about 30 mph, tranny shifts hard on 2nd to drive shift. Read possible diagnosis' online. Plan A: uncoupled large electrical loom plug under the cab below driver's seat. No moisture, but carefully applied heat gun anyhow. NOPE. Plan B: Replaced ABS speed sensor on the top of the differential. Mazda did not have one so went to Ford, part # F85Z-9E731-AB. Cost: $36.24. Easy fix. Backed truck up on metal ramps , blocked front tire. Left wire plug on the sensor, removed 1 bolt and wiggled the sensor out of it's hole. Then removed plug and plugged to new sensor. Put a film of oil on the sensor's O-ring, and wigged it back down into the hole. 1 bolt later and DONE. Drove it - worked fine, but Check Engine light still on. Disconnected + side battery cable for 2 hours to let that reset, and there you have it.

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12y ago
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6mo ago

The ABS light in a Mazda B3000 can come on due to issues with the ABS system, such as a faulty wheel speed sensor, a malfunctioning ABS module, or low brake fluid. It is recommended to have the ABS system checked by a professional mechanic to diagnose and repair the issue.

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Q: Why does a Mazda b3000 abs light come on?
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