Anti-Lock Brake System (ABS) Tone Ring/Sensor Inspection
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Visually inspect for damaged teeth 1 on the front and rear ABS tone rings. Inspect for nicks and dents on the face of the teeth. The teeth edges should be consistent in appearance. If a tone ring is damaged, see your dealer for replacement as soon as possible.
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Inspect for debris adhering to the end of the wheel speed sensors 2. If contamination is observed, or if you are unable to visually inspect, slide a thin towel across the face of the sensor between the sensor and the tone ring to remove any potential debris.