Description
AFIL lane monitoring sensor number 4 for Citroën and Peugeot vehicles. A screw that secures the unit to the wheel arch may be seized – it must be drilled out.
The AFIL lane monitoring sensor is a critical component of the lane departure / lane keeping assistance systems fitted to many Citroën and Peugeot models. Supplied under OEM references 9663116580 and 6590W1, this sensor monitors vehicle position relative to lane markings and provides input to the vehicle electronic systems that warn or assist the driver when the vehicle drifts from its lane. The unit is commonly searched for by its product codes, so listing 9663116580 and 6590W1 in your enquiry will speed up identification.
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: 9663116580, 6590W1
- Additional Numbers: 6590 W1, 9663 116 580 (variants and spacings may be used in catalogs)
Installation Recommendations
Recommended for experienced technicians or competent DIYers. Before starting, follow general safety procedures: isolate the vehicle electrical system according to manufacturer guidance. Typical replacement steps:
- Park the vehicle on a level surface and secure it. If required, remove the relevant wheel to improve access.
- Remove the inner wheel arch liner or bumper trim to reach the AFIL unit mounted near the wheel arch or front structure.
- Disconnect the electrical connector from the sensor. Inspect the plug and wiring for corrosion or damage.
- Remove the mounting fastener. If the screw is seized or rusted (a common issue), it may be necessary to drill it out carefully as noted in the original description.
- Fit the new sensor, secure it to the body using appropriate hardware, reconnect the electrical connector and reassemble trims.
- After replacement, perform the vehicle’s ADAS self-check and recalibration procedures where required by the manufacturer to ensure correct lane detection performance.
Most Common Failure Causes
- Corroded or Seized Mounting Screw: Prolonged exposure to road salt and moisture often seizes the fastener holding the unit to the wheel arch; drilling out the screw is frequently required.
- Water Ingress And Corrosion: Moisture can penetrate the connector or housing, causing intermittent faults or total failure.
- Mechanical Damage: Impacts to the bumper or wheel arch area can misalign or damage the sensor.
- Electrical Faults: Damaged wiring, poor connectors or short circuits lead to communication errors with the vehicle ECU.
This AFIL sensor (OE 9663116580 / 6590W1) is a direct search term for workshops and self-repairers looking to restore lane monitoring functionality on the listed Citroën and Peugeot models. Clear identification by product code reduces installation time and helps ensure you order the correct unit for efficient replacement.
