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To check if a speed sensor is bad. Pull the sensor and connect your ohm (resistance) meter probes to the two terminals of the speed sensor. There needs to be 7 or more pulses of zero resistance, and the resistance between needs to be infinite. There are 2 speed sensors, an input and output. I had this happen once, and to put it real simply, your speedometer won't work anymore.

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Q: How do you know when the speed sensor needs to be replaced?
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