C0131moderate severityChassis
Brake Pad Wear Sensor Circuit Rear
on 2004-2011 Volvo S40 2.4L I5 · FWD
What this code means
The rear brake pad wear sensor indicates pads are worn or the circuit is faulty.
Symptoms
- Brake pad warning light
- Service message for rear brakes
- Reduced braking from rear
Common causes
- Rear brake pads at minimum thickness
- Wear sensor wire damaged
- Connector not reattached after service
Diagnostic steps
- Check rear brake pad thickness
- Inspect wear sensor wire
- Check sensor connector
- Measure pad thickness
Repair notes
Replace rear brake pads and wear sensors.
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