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You can check the sensor with an A/C voltmeter. Jack up the LF wheel. Follow the ABS sensor wire until you find the connector. Disconnect the abs sensor wire & hook up the voltmeter to the two connector leads coming from the sensor (you may need a couple of paperclips to poke into the connector end to give your voltmeter something to clamp to). Spin the tire - you should see a low amount of A/C voltage generated from the sensor when you spin the wheel. Faster you spin, higher the current. It induces current from the metal teeth on the tone ring (on the backside of the hub) passing a small magnet in the end of the sensor.
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