Description
AFIL lane-keeping monitoring sensor number 6 for Citroën and Peugeot vehicles. A screw that secures the unit to the wheel arch may be seized — it will need to be drilled out.
This AFIL (Lane Departure Warning) sensor is designed for Citroën and Peugeot models and is commonly sought under part numbers such as 9659847680, 603.016 or 6590W1. It supports driver-assist functions that monitor lane position and alert the driver to unintentional lane departures. The unit is a practical replacement part for workshops and experienced DIY mechanics who maintain or restore steering-assist and lane-keeping functionality on Stellantis vehicles.
Technical Information
- Manufacturer: Stellantis / Citroën / Peugeot
- Model: Citroën C4, Citroën C4 Picasso, Citroën C5, Citroën C5 X7, Peugeot 308, Peugeot 407
- Product Codes: 9659847680, 603.016, 6590W1
- Other Numbers: AFIL Sensor No. 6
Fitment And Function
The sensor monitors lane position and feeds data to the vehicle’s lane-departure/driver-assist system. Correct fitment and secure mechanical attachment are essential for reliable operation and accurate system performance. The sensor typically mounts to a body panel area such as the wheel arch or inner wing and connects to the vehicle wiring harness via a dedicated connector.
Installation Recommendation
- Work In A Clean, Dry Environment: Ensure the area around the mounting point and connector is free of dirt and moisture before installation.
- Access: Remove the wheel arch liner or relevant trim to reach the mounting screw and electrical connector safely.
- Dealing With A Seized Screw: If the original mounting screw is seized by corrosion, drill it out carefully and prepare the mounting hole for the replacement screw or fastener. Take care not to damage the sensor housing or surrounding sheet metal.
- Electrical Connection: Inspect and clean the connector contacts; replace damaged seals to prevent water ingress.
- Tightening: Fasten to manufacturer torque specifications where available. Avoid overtightening to prevent housing damage.
- Calibration: After replacement, follow the vehicle manufacturer’s procedure for system initialization or calibration—lane-keeping systems often require electronic alignment or a drive-and-learn procedure to restore full functionality.
Most Common Reasons For Failure
- Mechanical Damage: Impacts from road debris or minor collisions can misalign or break the sensor.
- Corrosion And Seized Fasteners: Long-term exposure to moisture and road salt often causes the mounting screw to seize and can compromise the electrical ground or mounting integrity.
- Water Ingress And Connector Corrosion: Moisture entering the connector leads to intermittent signals or complete failure.
- Electrical Issues: Wiring harness damage, connector wear, or internal electronics fault can cause malfunctioning warnings or loss of lane-monitoring capability.
Replacement of this sensor restores the lane-monitoring system when faults are caused by the sensor itself or its mounting. Use the exact part numbers listed above (9659847680, 603.016, 6590W1) to locate the correct unit for the specified Citroën and Peugeot models and to ensure compatibility with the vehicle’s AFIL system.
