What it means
The module has detected LF wheel-speed signal performance outside of tolerance (erratic/implausible vs. other sensors), not merely an open/short. Crypton
Symptoms
- ABS lamp; possible stability/traction messages.
Common causes / fixes
- LF sensor marginal output or debris on a magnetic encoder bearing; excessive air gap; harness resistance.
- Clean/reseat/replace sensor; repair wiring; replace hub if encoder is damaged. Crypton