C0040moderate severityChassis
Right Front Wheel Speed Sensor Circuit
on 2003 Subaru WRX STI 2.5L Turbo H4 · AWD
What this code means
Malfunction in the right front ABS wheel speed sensor.
Symptoms
- ABS light on
- Traction control light on
- ABS inactive
Common causes
- Faulty sensor
- Tone ring damage
- Wiring issue
- Wheel bearing failure
Diagnostic steps
- Test sensor
- Inspect tone ring
- Check wiring
- Check bearing
Repair notes
Replace sensor. Check bearing and tone ring.
Other Chassis codes on this vehicle
C0021
LF Wheel Speed Sensor Range/Performance
C0022
RF Wheel Speed Sensor Range/Performance
C0023
LR Wheel Speed Sensor Range/Performance
C0024
RR Wheel Speed Sensor Range/Performance
C0025
LF Wheel Speed Sensor Circuit Intermittent
C0026
RF Wheel Speed Sensor Circuit Intermittent
C0027
LR Wheel Speed Sensor Circuit Intermittent
C0028
RR Wheel Speed Sensor Circuit Intermittent
C0035
Left Front Wheel Speed Sensor Circuit
C0036
Left Front Wheel Speed Signal Erratic