Description
Steering angle sensor for Citroën Peugeot vehicles
Suitable for Citroën C5 X7, C4 Picasso, C4
The Steering Angle Sensor (SAS) is a precision electronic sensor that measures the angle and rotational speed of the steering wheel. This unit provides critical input to the vehicle stability control (ESP/ESC), ABS, and driver assistance systems, helping the car determine the driver’s intended direction and correct vehicle dynamics when required. Compatible with a range of Citroën/Peugeot models, this part is often sought by part number (0265005517, 9658684180, 4545H8) and is intended for professional mechanics and experienced DIYers.
Why This Part Matters
A correctly functioning steering angle sensor is essential for accurate stability control, traction intervention and proper operation of systems that depend on steering position feedback. A faulty sensor typically triggers warning lights (ESP/ABS), can disable some driver aids and may impair the car’s safety behavior in emergency maneuvers. Replacing a failed sensor restores system accuracy and prevents incorrect interventions.
How It Fails And Typical Lifespan
- Not a regular wear item: under normal conditions the sensor can last many years.
- Common failure causes: impact from accidents, moisture or corrosion on connectors, wiring damage, electrical surges, or internal electronic degradation.
- Symptoms of failure: ESP/ABS warning lights, inconsistent steering angle readings, loss of stability control functionality, or fault codes stored in the vehicle ECU.
Replacement Procedure (Overview)
Replacement requires care because the sensor is registered to steering position and related systems. Typical steps:
- Park vehicle on level ground and engage the parking brake.
- Disconnect the battery before beginning work to avoid airbag deployment.
- Mark the steering wheel position relative to the shaft to preserve alignment.
- Remove the airbag module and steering wheel according to manufacturer instructions to access the sensor (location varies: many PSA cars have the sensor integrated in or near the steering column/clockspring assembly).
- Replace the sensor and reconnect wiring, ensuring connectors are clean and fully engaged.
- Reassemble steering components, torque fasteners to manufacturer specification and reconnect the battery.
- Calibrate the steering angle sensor using the appropriate diagnostic tool for Citroën/Peugeot to clear codes and initialise the unit.
Installation Recommendations
- Always disconnect the battery before disassembly and follow the vehicle manufacturer’s safety procedures to avoid damage or airbag activation.
- Do not rotate the steering column or wheels while the sensor is removed or un-initialised.
- After installation, perform an electronic calibration of the steering angle sensor with a suitable diagnostic tool (e.g. DiagBox/Lexia/PP2000) so the ESC/ABS systems recognise the new unit and steering neutral position.
- If wiring or connectors are corroded, repair or replace them to prevent future faults.
- If unsure, have the replacement and calibration performed by a professional with PSA diagnostic equipment.
Common Causes Of Failure
- Impact or collision that shifts steering components.
- Water ingress or corrosion on electrical connectors.
- Damaged wiring harness from steering column movement or prior repairs.
- Internal electronic component failure due to age or electrical transients.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Citroën C5 X7, Citroën C4 Picasso, Citroën C4
- Product Codes: 0265005517, 9658684180, 4545H8
- Other Numbers: None provided
Notes For Professionals
This sensor is often purchased by mechanics searching by OEM or supplier part number. Ensure correct alignment and perform calibration after fitting to avoid residual faults and improper ESC behavior. Replacing the sensor without calibration can leave the safety systems operating with incorrect steering angle input.
