This replacement bulb socket assembly is intended for the right outer rear lamp of the Citroën C4 II (B7) second generation. Designed for professional mechanics and competent DIYers, the part restores reliable electrical contact for tail, brake and turn signal functions and is frequently searched by part number 6351KS. The unit includes the bulb holders and a short length of wiring for straightforward plug-in replacement.

Technical Information

• Manufacturer: Stellantis / Citroën / Peugeot
• Model: Citroën C4 II (B7) Second Generation
• Product Codes: 6351KS
• Other Numbers: None Provided

Function And Benefits

The socket assembly secures the rear lamp bulbs in the right outer tail lamp cluster and provides the electrical connections for lighting circuits (tail, brake, indicator and possibly reverse depending on lamp configuration). A healthy socket ensures solid contact, correct lamp operation and minimises intermittent faults caused by loose or corroded contacts. Installing a fresh socket reduces the risk of flickering lights, poor lamp contact and heat-related failures.

Installation Recommendations

1. Safety First: Disconnect the negative battery terminal before working on the rear lighting harness to avoid short circuits.
2. Access: Open the boot and remove any trim panels or covers to reach the rear lamp cluster. Remove lamp cluster fasteners and carefully extract the lamp unit from the body aperture.
3. Disconnect: Unplug the original wiring connector from the lamp and remove the old bulb socket by releasing its retaining tabs or clips.
4. Fit New Socket: Insert the new socket into the lamp body until it clicks into place. Ensure the wiring is routed the same way as factory to avoid pinching.
5. Test: Reconnect the battery, test all lamp functions (tail, brake, indicator and reverse if applicable) before reassembling trims.
6. Reassembly: Secure the lamp cluster back into the vehicle, reinstall trim and confirm watertight seating of the lamp to prevent ingress.

Most Common Failure Reasons

• Corrosion And Water Ingress: Moisture and road salt lead to oxidised contacts and poor conductivity.
• Heat And Thermal Cycling: Repeated heating of bulbs and cooling causes plastic to become brittle and contact points to loosen.
• Vibration And Mechanical Stress: Road vibration and repeated removal/installation can break retaining tabs or damage wiring.
• Poor Contact Or Loose Connections: Worn contacts create intermittent operation, flicker or increased resistance and local heating.

Signs that this socket needs replacing include intermittent lamp operation, one lamp function not working while others do, visible corrosion at contacts or melted/deformed plastic around the socket. In everyday use, sockets often fail after many years—commonly observed on vehicles older than 8–12 years or in regions with heavy road salt or frequent moisture exposure.

This part is intended for direct replacement of the right outer rear lamp socket on compatible Citroën C4 II vehicles. Customers commonly search using the part code 6351KS when looking for this exact component.

This right rear outer tail light is a direct-fit replacement for the Citroën C4 II (second generation). Ideal for professional garages and experienced DIY mechanics, the unit restores rear lighting functions and exterior appearance after collision damage, cracking or moisture ingress. The assembly is commonly searched by part numbers 9687311980 and 6351KS, so listing these codes in your search will help you find the exact match faster. Note: The lamp is supplied without the bulb holder and bulbs.

Technical Information

• Manufacturer: Stellantis / Citroën
• Model: Citroën C4 II (B7) – Second Generation
• Product Codes: 9687311980
• Additional Numbers: 6351KS
• Position: Right, Outer Rear Lamp (Passenger Side on Left-Hand-Drive Vehicles)
• Supply Scope: Lamp housing only — bulb holder and bulbs not included

Installation Recommendations

Replacement is straightforward for a competent mechanic or experienced DIYer. Typical steps: open the boot and remove the inner trim to access the lamp fasteners; undo the securing screws or nuts; carefully pull the lamp assembly outward, unplug the electrical connector and remove the old unit. Fit the new lamp by reversing the procedure: connect the wiring harness, check the seal and alignment, secure fasteners to hand-tight plus a small additional turn (avoid overtightening), reinstall the trim and test all light functions (position, brake, indicator). Always disconnect the battery or ensure ignition is off when handling electrical connectors. Replace bulbs and holders separately if required and verify correct bulb types from the vehicle manual before installation.

Why This Part Fails Most Often

• Impact Damage: Rear collisions or parking knocks commonly crack the lens or damage mounting tabs.
• Moisture Ingress: Worn seals or cracked housings allow water entry, causing corrosion of sockets and connectors.
• Connector And Socket Corrosion: Oxidation of terminals or bulb holders leads to intermittent or lost function.
• Mechanical Wear: Plastic clips and mounting points can become brittle with age and break during removal or from vibration.

Choosing the correct replacement by part number (for example 9687311980 or 6351KS) ensures fitment and reduces installation time. Regular visual inspection of seals and connectors helps prevent failures caused by moisture and corrosion.