Chassis (C)
C0040: Right front wheel speed sensor issue
The signal from the right front wheel speed sensor is missing or not making sense. This can affect the car's braking system.
Checked by a licensed car technician · last reviewed 29 September 2026
Symptoms
- ABS warning light on
- Traction control light on
- Unusual braking behaviour
- Speedometer issues
Common causes
- Sensor damage
- Tone ring fault
- Harness issue
How to check it yourself
- Inspect the sensor for damage
- Check the wiring harness for faults
- Examine the tone ring for damage
- Compare wheel speeds during a road test with live data
Can I keep driving?
The car can be driven, but braking performance may be affected. Drive with caution.
General guidance, not a professional inspection. Confirm faults with measurements before buying parts, and use a qualified mechanic for brakes, steering, fuel leaks, airbags, and other safety-critical work. Terms and disclaimer