Location of the automatic transmission reverse sensor on a Citroen C4
1. Locate the following components in the engine compartment:
* Gearbox
* Wiring harness plug on transmission
2. Identify the wiring harness that runs from bottom to top to the rear of the transmission:
*This is the reverse solenoid wiring harness.
3. Locate the reverse sensor located on the reverse solenoid wiring harness:
*The sensor is a small black two-pin connector with an electrical connector.
*It is usually located at the rear of the transmission, near the reverse solenoid.
Replacing the automatic transmission reverse sensor on a Citroen C4
1. Disconnect the negative terminal of the battery.
2. Raise the car and place it on stands.
3. Locate the reverse sensor.
4. Disconnect the electrical connector from the sensor.
5. Unscrew the sensor using a 22mm wrench.
6. Apply sealant to the threads of the new sensor.
7. Screw the new sensor into the transmission.
8. Connect the electrical connector to the sensor.
9. Lower the vehicle from the stands.
10. Connect the negative terminal of the battery.
11. Check the operation of the reverse sensor by shifting the vehicle into reverse.