ABS and ESP
C0040 Right front wheel speed sensor: circuit fault
C0040 means: Right front wheel speed sensor: circuit fault. The ABS and stability system found a fault in a wheel sensor, the pump, a valve or the module. Drive gently and have the car checked soon. The most common repair costs about €80–160 in Estonia, depending on make and model.
Is it safe to drive?Get it checked soonDrive gently and have the car checked soon.
Sensor replacement€80–160parts and labour in Estonia, depending on make and model
What it means
The ABS and stability system found a fault in a wheel sensor, the pump, a valve or the module. The normal brakes still work, but ABS and ESP may be switched off.
What you may notice
- ABS and ESP lights on
- Wheels may lock on slippery roads
- The speedometer may not work on some cars
What could be wrong
- 1Wheel sensor faulty or covered in dirt · Sensor replacement €80–160
- 2Sensor wire broken near the wheel · Sensor replacement €80–160
- 3Damaged wheel bearing tone ring · Sensor replacement €80–160
- 4ABS pump or module · Control unit check and software €150–300
Repair difficulty: Moderate
What you can check yourself
Drive especially carefully on slippery roads because ABS may not work. Check that the sensor wire near the wheel is intact. You can check the simple things yourself, but the repair is best done in a workshop.
How we fix it
- We compare all wheel speeds on the diagnostic tool
- We measure the sensor and wiring
- We clean or replace the sensor or bearing, or repair the module
Standard SAE description: Right Front Wheel Speed Sensor Circuit