Description
AFIL lane monitoring sensor number 5 for Citroën and Peugeot vehicles. A seized screw may be holding the unit to the wheel arch — drilling out may be necessary.
This AFIL (lane monitoring) sensor is a direct-fit replacement part commonly used on a range of Citroën and Peugeot models. It monitors lane position to support lane-departure warning and lane-keeping assistance functions within the vehicle’s ADAS suite. The unit is frequently searched under part numbers 9659847580 and 6590W1, making it easy to find for workshops and DIY mechanics looking for a precise match.
Technical Information
- Manufacturer: Stellantis
- Model: Citroën C4; Citroën C4 Picasso; Citroën C5; Citroën C5 X7; Citroën C6; Peugeot 308; Peugeot 407
- Product Codes: 9659847580, 6590W1
- Other Numbers: 603.015
Installation Recommendations
Before starting, isolate the vehicle electrical system by disconnecting the negative battery terminal. Access to the AFIL sensor is typically gained via the wheel-arch liner or lower bumper trim depending on model. Remove the trim fasteners and locate the sensor housing. Unplug the electrical connector and remove the mounting fasteners. Be aware that the original mounting screw can be seized or corroded; in that case it may need to be drilled out as noted in the original report. Install the new sensor, secure with appropriate fasteners, reconnect the plug, refit the trim and reconnect the battery. After replacement, perform ADAS calibration or sensor alignment according to manufacturer requirements — many lane monitoring systems require calibration to ensure correct operation.
Most Common Cause Of Failure
Failures most often result from water ingress and corrosion of the connector or housing, mechanical damage from road debris or minor collisions, and electrical faults at the plug or wiring. Corroded or seized mounting hardware is a frequent issue where the sensor is attached to inner fenders or brackets, which can make removal more difficult and require drilling out fasteners. There is no fixed replacement interval; parts commonly fail after impacts, long-term exposure to moisture, or when connectors become oxidized.
For technicians and competent DIY mechanics: when sourcing this part, search by the listed product codes (9659847580, 6590W1, 603.015) and verify fitment against the vehicle model and production year. Proper installation and post-fitment calibration are key to restoring full lane monitoring functionality.
