OBD · Chassis and brakes
C0040 Right front wheel speed sensor circuit
What this code means
C0040 is a generic OBD code shared by all manufacturers since 2001 for petrol and 2004 for diesel. It relates to: chassis and brakes. The code tells you what the ECU measured as abnormal, not necessarily which part to replace.
Most common causes
- Faulty ABS sensor#1
Cost of related repairs
| Independent garage | Main dealer | |
|---|---|---|
| ABS wheel speed sensor | £55 – £175 | £75 – £280 |
How to read this code
An OBD scanner plugged into the 16-pin socket under the steering wheel reads and clears codes. Bluetooth models cost £20 to £40. Clearing a code without fixing the fault is pointless: it comes back.
Frequently asked questions
What does code C0040 mean?
C0040: Right front wheel speed sensor circuit. C0040 is a generic OBD code shared by all manufacturers since 2001 for petrol and 2004 for diesel. It relates to: chassis and brakes. The code tells you what the ECU measured as abnormal, not necessarily which part to replace.
Can I drive with code C0040?
Fix soon. Drive gently and as little as possible. The fault can get worse and damage other parts.
How much does it cost to fix C0040?
ABS wheel speed sensor: £55 – £175.
How to read this code
An OBD scanner plugged into the 16-pin socket under the steering wheel reads and clears codes. Bluetooth models cost £20 to £40. Clearing a code without fixing the fault is pointless: it comes back.