OBD-II code · Chassis
C051A Left Rear Wheel Speed Sensor - Mechanical
Left Rear Wheel Speed Sensor - Mechanical: a mechanical fault is present — typically a damaged tone ring, excessive air gap, or loose mounting. Wheel-speed signals feed ABS, ESC, traction control and the speedometer.
Is it safe to drive with C051A?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyTone ring damaged
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–3 h
- Emissions test
- Usually unaffected
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Wss Lr, Tone Ring Lr
Related codes
- C0517Right Rear Wheel Speed Sensor A Correlation
- C0518Left Front Wheel Speed Sensor - Mechanical
- C0519Right Front Wheel Speed Sensor - Mechanical
- C051BRight Rear Wheel Speed Sensor - Mechanical
- C051CMulti-axis Acceleration Sensor Module A Range/Performance
- C051DMulti-axis Acceleration Sensor Module A Missing Calibration
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.