E21 - Speed Sensor Fault
Speed signal is missing or abnormal.
Medium severity
Caution rideability
Soon urgency
What it means
Controller cannot detect wheel speed.
Common causes
- Magnet missing
- Sensor too far
- Damaged speed sensor cable
Symptoms
- Speed reads 0
- Assist cuts out
- Wrong distance
How to fix it
- Align magnet
- Check sensor gap
- Replace speed sensor