C0028moderate severityChassis
RR Wheel Speed Sensor Circuit Intermittent
on 2009 Audi A6 3.0L Supercharged V6 · AWD
What this code means
The right rear wheel speed sensor signal is intermittent.
Symptoms
- Intermittent ABS light
- Inconsistent rear braking
- Stability control fault intermittent
Common causes
- Wiring fatigue near rear suspension
- Road debris damage to harness
- Corroded rear connector
- Sensor retention clip broken
Diagnostic steps
- Road test with live data monitoring
- Inspect wiring along suspension travel path
- Check connector condition
- Test sensor mounting security
Repair notes
Repair wiring or connector. Replace retention hardware.
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
C0035
Left Front Wheel Speed Sensor Circuit
C0036
Left Front Wheel Speed Signal Erratic
C0040
Right Front Wheel Speed Sensor Circuit