Description
Steering angle sensor for Citroën C4 and C4 Picasso vehicles
The Steering Angle Sensor (SAS) 0265005486 / 9662937380 (also referenced 4545H8) is a direct-fit component for many Citroën C4 and C4 Picasso models. Designed to provide accurate steering wheel position and rate information to the vehicle stability control (ESP/ABS) and other driver assistance systems, this unit is commonly searched by its part numbers and is suitable for professional workshops and competent DIYers who perform diagnostics and recalibration after replacement.
Technical Information
- Manufacturer: Stellantis / Citroën / Peugeot
- Model: Citroën C4, Citroën C4 Picasso
- Product Codes: 0265005486, 9662937380
- Other Numbers: 4545H8, 265005486
Function And Application
The steering angle sensor measures the absolute angle and angular velocity of the steering wheel. Its data is used by the ESP/ABS, traction control, electronic stability aids, and, in some systems, by advanced driver assistance modules. Correct and stable SAS readings are essential for accurate intervention of braking and stability systems during cornering and emergency maneuvers.
How It Is Replaced
The sensor is typically located on the steering column assembly, often integrated with or mounted close to the clock spring. Replacement steps (general guidance):
- Secure the steering wheel in the straight-ahead position.
- Disconnect the battery and wait a few minutes to ensure system discharge.
- Remove trim panels and, if required on the model, the steering wheel and airbag following manufacturer safety procedures.
- Access and disconnect the SAS electrical connector and remove the fastening hardware.
- Install the new sensor in the identical orientation, torque fasteners to manufacturer values, reconnect the connector and reassemble.
- Perform steering angle sensor calibration/initialization with a diagnostic tool (see below).
Calibration And Diagnostics
After installation the Steering Angle Sensor must be zeroed or calibrated so the vehicle control units recognize the new reference position. Most PSA vehicles require a diagnostic tool to perform the SAS recalibration or automatic relearn procedure. Without correct calibration, ESP/ABS warnings and degraded stability control can occur. Recommended diagnostic tools include manufacturer-level scanners that support PSA procedures (for example DiagBox/LEXIA where applicable) or equivalent professional scan tools with SAS functions.
Installation Recommendations
- Always disconnect the battery before starting work and follow airbag safety procedures. Mishandling the airbag or connectors may cause injury or system faults.
- Set the steering wheel to the straight-ahead position and do not rotate the wheels during sensor removal/installation to preserve alignment reference.
- Use correct tools and torque values for fixing screws; avoid stressing the sensor housing or connector pins.
- After fitting, perform a full calibration/initialization of the steering angle sensor with a suitable diagnostic tool and clear any stored fault codes.
- If unsure about airbag or steering column disassembly, have the replacement performed by a trained technician.
Most Common Reasons For Failure
- Electrical Faults: Intermittent contacts, damaged wiring or corroded connectors leading to communication errors.
- Mechanical Damage: Impact from accidents or incorrect handling during steering wheel removal can damage the sensor or its mount.
- Wear And Aging: Internal electronics or sensors can degrade over many years/mileage, causing drift or loss of signal.
- Environmental Issues: Moisture ingress or contamination around the steering column can affect sensor reliability.
Why Choose This Part
This steering angle sensor is supplied under the referenced OEM numbers frequently used in parts lookup (0265005486, 9662937380, 4545H8). It is suitable for workshops that require traceable, correctly referenced components to restore proper ESP/ABS function on Citroën C4 and C4 Picasso vehicles. Searching by part number will help you find the exact match for your repair.
