Description
AFIL Lane Departure Monitoring Sensor No. 3 for Citroën and Peugeot vehicles. A screw that secures the unit to the inner wheel arch may be seized — it may be necessary to drill it out.
This AFIL (lane keeping/monitoring) sensor is an original-equipment style replacement designed for mechanics and experienced DIYers maintaining Citroën and Peugeot cars. The unit monitors lane position and works with the vehicle’s driver assistance systems to detect lane departure or lane drift. Commonly searched and ordered by part numbers, this sensor is suitable when diagnosing ADAS warnings or persistent lane-keeping faults. Fitment by part number ensures quick identification and reduces time spent troubleshooting incompatible parts.
Technical Information
- Manufacturer: Stellantis / Citroën / Peugeot
- Model: Citroën C4; Citroën C4 Picasso; Citroën C5; Citroën C5 X7; Citroën C6; Peugeot 308; Peugeot 407
- Product Codes: 9659847380; 603.013; 6590W1
- Additional Numbers: AFIL Sensor No. 3
Installation Recommendations
Replacement should be carried out by a qualified technician or a skilled DIY mechanic with appropriate tools. Typical steps:
- Safely lift the vehicle and secure on stands. Remove the relevant wheel if access to the inner fender liner is required.
- Remove the inner wheel arch liner to expose the sensor mounting area.
- Disconnect the electrical connector and remove the retaining screw(s). Note: The mounting screw can be corroded or seized; if so, drilling out the screw may be necessary, as indicated in the original note.
- Fit the replacement sensor, ensure all seals and clips are correctly positioned, reconnect the electrical connector, and reassemble the liner and wheel.
- After installation, clear any stored fault codes and perform a diagnostic check. Some vehicles may require a system calibration or relearn procedure using a suitable diagnostic tool to restore full lane-keeping functionality.
Common Failure Causes
- Corrosion and Moisture Ingress: Exposure to road salt and water can corrode mounting hardware and connectors, causing failures or poor electrical contact.
- Mechanical Damage: Impacts from road debris or accidental knocks during repairs can damage the sensor or its alignment.
- Seized Mounting Screw: Corroded or seized screws that secure the unit to the inner wheel arch are a frequent issue and may require drilling out.
- Electrical Faults: Connector corrosion, wiring damage, or internal electronics failure can trigger lane-assist warnings.
- Age and Wear: There is no fixed service interval; the sensor typically lasts several years but will fail sooner under harsh conditions.
Choose this AFIL Sensor No. 3 when replacing a faulty lane-monitoring unit by part number (9659847380 / 603.013 / 6590W1). If you are a professional mechanic or an experienced DIYer, this direct-fit replacement reduces workshop time and helps restore proper lane-assist operation quickly.
