1. Clean the encoder, and make sure no metal is stuck to the encoder surface.

1. Check the magnetic encoder (A) for damage. If cracked or damaged, replace the encoder.
   - Front wheel bearing replacement
   - Rear hub bearing unit replacement

1. Measure the air gap between the wheel sensor (B) and the magnetic encoder all the way around while rotating the encoder.

   Standard:
   | Front: | 0.5−1.2 mm (0.02−0.05 in.)
   | Rear: | 0.4−1.1 mm (0.02−0.04 in.)

Front
Rear