C0023moderate severityChassis
LR Wheel Speed Sensor Range/Performance
on 2004 Subaru Legacy 3.0L H6 · AWD
What this code means
The left rear wheel speed sensor output is outside expected parameters for current vehicle speed.
Symptoms
- ABS light on
- Rear ABS only partially functional
- Stability control warning
Common causes
- Sensor contaminated with debris
- Tone ring runout
- Damaged sensor tip
- Axle bearing wear
Diagnostic steps
- Compare rear sensor speeds at steady cruise
- Inspect sensor for metallic debris buildup
- Measure tone ring runout with dial indicator
- Check axle bearing
- Test sensor output voltage
Repair notes
Clean sensor and tone ring. Replace sensor if output is weak.
Other Chassis codes on this vehicle
C0021
LF Wheel Speed Sensor Range/Performance
C0022
RF 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
C0040
Right Front Wheel Speed Sensor Circuit