Front ABS Wheel Speed Sensor 99-02 Audi A4 A6 VW Passat ... (Logan Jones)
Finally ended up pulling the plug under the drivers wheel well and finding the wiring harness had been "adapted". It appears to be somewhere through the top rear of the wheel arch. Wheel speed sensor connects to the wire harness at the outboard side under the rear lower seat cushion.
Replaced the ABS speed sensor and nothing.
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Synopsis: A malfunctioning wheel speed sensor can cause the anti-lock braking and traction control systems to become disabled, among other things. I was able to use the above procedure all three times to successfully locate the failed sensor. ABS Brake Wheel Speed Sensor Testing.
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