Description
AFIL Lane Departure Monitoring Sensor Number 4 For Citroën And Peugeot Vehicles. The Screw That Secures The Unit To The Wheel Arch May Be Seized — Drilling Out May Be Necessary.
This AFIL (Lane Departure) sensor is a direct-fit electronic component used on a range of Citroën and Peugeot models to monitor lane position and support driver assistance systems. Supplied under OEM references 9663116280 / 6590W1 / 603.012, the sensor is designed for professional workshops and experienced DIYers who perform ADAS-related repairs. It is commonly searched by part number (9663116280, 6590W1) so listing these codes increases findability in online searches.
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: 9663116280, 6590W1, 603.012
- Additional Numbers: AFIL Sensor No. 4
Function And Benefits
The AFIL sensor continuously monitors lateral vehicle position relative to lane markings and provides input to lane departure warning and driver assistance systems. Replacing a faulty sensor restores reliable lane detection, reduces false warnings, and ensures proper operation of safety features that rely on lane information. Using the correct OEM-coded part (9663116280 / 6590W1) helps maintain factory-level compatibility.
Replacement And Installation Notes
Access Typically Requires Removal Of The Wheel Arch Liner To Reach The Sensor Mounting. Before Starting, Isolate The Vehicle Electrical System (Follow Manufacturer Safety Procedures). Unplug The Electrical Connector, Remove The Mounting Screw(s) And Replace The Unit With The New Sensor. If The Original Mounting Screw Is Seized To The Wheel Arch, It May Need To Be Drilled Out Carefully — As Noted In The Original Description. After Mechanical Fitment, Reconnect The Wiring And Secure All Fasteners To Specified Torque.
Calibration
After Replacement, The Vehicle’s Driver Assistance System May Require Software Calibration Or Alignment Using Diagnostic Equipment To Ensure Correct Sensor Orientation And System Performance. Calibration Procedures Vary By Model And Year.
Most Common Failure Reasons
- Corrosion Or Water Ingress Into Connector Or Housing Causing Intermittent Or Permanent Faults.
- Impact Or Mechanical Damage From Road Debris Or Minor Collisions.
- Electrical Faults Such As Short Circuits, Damaged Wiring Or Connector Oxidation.
- Seized Mounting Screws Leading To Difficult Removal — May Require Drilling.
Installation Recommendations
- Use Proper Diagnostic Tools To Confirm The Sensor Is The Faulty Component Before Replacement.
- Work In A Clean, Well-Lit Area; Protect Connectors From Contamination During Installation.
- If A Screw Is Seized, Use A Drill Or Appropriate Extraction Tools Carefully To Avoid Damaging Bodywork.
- After Fitting, Perform Any Required Software Calibration With Dealer Or Workshop Diagnostic Equipment.
- Verify System Operation By Road Test In Safe Conditions After Calibration.
Part Numbers: 9663116280, 6590W1, 603.012 — Keep These Codes Handy When Searching Or Ordering To Ensure Correct Fitment For Citroën And Peugeot Vehicles Listed Above.
