High-quality replacement electric door lock for the right front (passenger) door of the Citroën C4 (first series, 5‑door). Designed as a direct-fit unit to restore reliable central locking function, this lock is commonly sought under part numbers such as 9681331480 and 9136AG. Ideal for professional garages and DIY mechanics who need a durable, easy-to-install solution to door locking failures, the mechanism addresses common issues like actuator wear, water ingress and broken plastic gears.

Key Features

• Direct replacement for right front (passenger) door central locking.
• Compatible with Citroën C4 5-door models of the first series.
• Commonly referenced by OE and aftermarket numbers: 9681331480, 9683415980, 9660699780, 9647172680, 9136ES, 9136AG, 9136R8.
• Restores electric locking/unlocking and mechanical latch function.
• Suitable for workshop fitment or competent DIY installation.

Technical Information

• Manufacturer: Stellantis / Citroën
• Model: Citroën C4 (First Generation) 5‑door — Right Front (Passenger) Door
• Product Codes: 9681331480, 9136AG
• Other Numbers: 9683415980, 9660699780, 9647172680, 9136ES, 9136R8, F03

Installation Recommendations

Always follow safe workshop procedures. Before starting, disconnect the vehicle battery to avoid short circuits and accidental airbag deployment. Typical replacement steps:

• Remove the interior door trim and any vapor barrier carefully to access the lock assembly.
• Disconnect electrical connector(s) to the lock actuator and unclip/unscrew the lock unit from the door shell.
• Release and note the positions of all mechanical linkages and rods; transfer them to the new lock in the same orientation.
• Install the new lock, secure fasteners to the manufacturer’s torque recommendations, reconnect the electrical connector and briefly reconnect the battery to verify operation before reassembling the door trim.
• Lubricate latch points and check door alignment and striker engagement to prevent premature wear.

Why This Part Typically Fails

• Electrical Motor/Actuator Wear: Frequent use leads to motor fatigue or burned windings, causing intermittent or complete failure to lock/unlock.
• Water Ingress And Corrosion: Moisture entering the door can corrode electrical contacts and mechanical components, especially in older seals.
• Broken Plastic Gears Or Clips: Internal plastic components can crack or strip, preventing the mechanism from moving.
• Mechanical Overload Or Impact: Door misalignment, hard closing or accidental impact can deform levers or the latch body.
• Connector/Pin Corrosion: Poor contact at the electrical connector can lead to erratic behavior.

Practical Tips For Mechanics And DIYers

• Check electrical continuity and 12V supply at the connector before replacing the lock to avoid unnecessary part changes.
• If transferring linkages, mark rod positions to ensure correct reassembly and avoid jammed doors.
• Inspect and replace door seals or drainage if water ingress is suspected to extend the service life of the new lock.
• Test central locking operation (remote and door switch) with the door open before final trim reinstallation.

This replacement right front door lock is a practical solution for Citroën C4 owners and workshops troubleshooting central locking faults. Fast identification by OE numbers (e.g. 9681331480, 9136AG) speeds up ordering and reduces downtime.