Description

Direct-fit bulb holder designed for the left rear lamp of Citroën C4 Coupe (3-door). This practical replacement part restores secure electrical contact and mechanical retention for brake, tail or indicator bulbs. Ideal for professional workshops and DIY enthusiasts who frequently search by part number (9646801777, 6350T6) to find the correct item quickly.

Technical Information

• Manufacturer: Stellantis / Citroën
• Model: Citroën C4 Coupe (3-door), C4 I (first generation), approx. 2004–2010
• Product Codes: 9646801777, 6350T6
• Other Numbers: 6350T6

Function

The bulb holder secures the bulb in the rear lamp assembly and provides the electrical connection between the vehicle wiring harness and the bulb contact points. A reliable holder ensures consistent lighting performance and prevents intermittent faults caused by poor contact, vibration or corrosion.

Installation

Typical replacement steps (may vary slightly by body trim and year):

• Open the boot and remove inner trim or access panel to reach the lamp cluster.
• Unscrew or unclip the lamp assembly retaining fasteners and carefully pull the cluster outward.
• Rotate the bulb holder anticlockwise (or release retaining clip) and disconnect the wiring connector.
• Replace the old holder with the supplied unit (including the short section of wiring), reconnect the connector and secure the holder in the lamp cluster.
• Refit the lamp assembly and interior trim, then test all light functions (tail, brake, indicator) before finishing.

Recommended Installation

Disconnect the negative battery terminal before working on the electrical system to avoid short circuits. Check bulb types and condition before fitting the new holder. Use dielectric grease on contacts to reduce the risk of corrosion. Tighten all fasteners to original fitment and verify lamp alignment and sealing to prevent water ingress.

Why This Part Commonly Fails

Failure is usually caused by moisture penetration, corrosion of contacts, heat-related deformation from high-wattage bulbs, or mechanical damage from vibration and repeated bulb changes. Wiring abrasion or broken connector tabs also leads to intermittent or permanent loss of contact.

Compatibility And Practical Tips

Search by OE numbers 9646801777 or 6350T6 to find matching listings quickly. This holder is typically used on left rear lamps of Citroën C4 Coupe (3-door) first generation models. When replacing, verify bulb type and lamp function; replace damaged seals to reduce the chance of repeat failure. For workshops, stocking common lamp sockets by part number speeds repairs and reduces vehicle downtime.

Premium-quality Left Rear Tail Light designed for Citroën C4 Coupé (3-door). This direct-replacement lamp carries the original part references often used by professionals: 9646801777 and 6350T6. Built to match the factory geometry and mounting points, it restores correct illumination, signaling and aesthetics at the rear of the vehicle. Ideal for mechanics and DIY enthusiasts who search by product code or OEM number.

Key Features

– Direct fit for Citroën C4 Coupé (3-door).
– OEM Reference Numbers: 9646801777 / 6350T6.
– Durable housing and lens designed to resist everyday road conditions.
– Restores Brake, Tail And Indicator Functions With Correct Optics.

Technical Information

• Manufacturer: Stellantis (Citroën)
• Model: Citroën C4 I (3-Door Coupé)
• Product Codes: 9646801777
• Additional Numbers: 6350T6

Contents And Compatibility Notes

The listing references the above OEM numbers which are commonly used when searching replacement lamps. According to the provided listing details, the lamp may be supplied without bulb sockets; check the product specification for included components before installation. This unit is intended to replace the left (driver-side) rear lamp assembly on the 3-door Citroën C4 Coupé first-generation models that share these part numbers.

Function And Common Faults

The rear lamp assembly houses brake light, tail light and turn signal functions and ensures correct light dispersion and visibility. Failures are typically caused by:

• Impact Or Body Damage: Cracked Lens Or Broken Mounting Tabs After Collisions.
• Moisture Ingress: Water Or Condensation Leading To Corroded Contacts And Short Circuits.
• Electrical Problems: Corroded Connectors Or Damaged Wiring Causing Intermittent Operation.
• Bulb Failure: Conventional Bulbs Reach End Of Service Life More Often Than The Housing Itself.
• Thermal Stress And UV Degradation: Fading Or Fragility After Many Years In Service.

How To Replace

Replacement is straightforward for a qualified mechanic or experienced DIYer. Typical steps:

• Open The Tailgate/Boot And Remove Any Trim Panels Covering The Lamp Mounting Area.
• Unscrew The Retaining Nuts Or Bolts That Secure The Lamp Assembly To The Body.
• Carefully Unplug The Electrical Connector(s). If The Connector Is Stiff, Use A Small Flat Tool To Release The Clip—Avoid Pulling On Wires.
• Remove The Old Assembly, Inspect The Mounting Gasket And Body Aperture For Rust Or Damage.
• Fit The New Lamp Into Position, Connect The Electrical Plug And Secure With Fixings. Ensure The Gasket Seats Correctly To Prevent Water Ingress.
• Test All Functions (Brake, Tail, Indicator And Reverse If Applicable) Before Refitting Trim.

Installation Recommendations

• Wear Gloves And Eye Protection. If Replacing Bulbs, Avoid Touching Halogen Bulb Glass With Bare Hands—Skin Oils Shorten Bulb Life.
• Check And Replace Any Damaged Seals Or Mounting Clips To Ensure A Watertight Fit.
• Inspect Wiring And Connectors For Corrosion; Clean Contacts And Apply Dielectric Grease If Needed.
• After Installation, Verify Light Alignment And Operation On Both Static And Dynamic Tests.

Why Professionals Choose OEM-Fit Lamps

Using a lamp that matches the original part numbers ensures proper fitment, correct light output and preserves vehicle appearance. For repair shops, fast identification by OEM code (9646801777 / 6350T6) speeds up ordering and reduces vehicle downtime.

Warranty And Quality Notes

Check the seller’s listing for warranty terms and included components. When replacing a rear lamp after an accident, always inspect adjacent bodywork and harnesses for hidden damage that may affect long-term reliability.

This left rear tail light assembly is a direct-fit replacement for Citroën C4 Coupé (3-door) and comes with integrated bulb sockets for straightforward installation. Supplied under OEM reference numbers 9646801777 and 6350T6, the lamp restores all rear light functions including tail/position, brake and indicator signals (bulbs not always included). Frequently searched by part number, this unit is ideal for professional technicians and DIY enthusiasts repairing accident damage or replacing a failed lamp module.

Technical Information

• Manufacturer: Stellantis (Citroën/Peugeot Group)
• Model: Citroën C4 Coupe (3-Door, First Generation)
• Product Codes: 9646801777, 6350T6
• Other Numbers: (Also referenced under internal Stellantis OE listings)
• Position: Left Rear (Driver Side In LHD Vehicles)
• Connector: Bulb Holder Sockets (requires appropriate replacement bulbs)

Installation Recommendations

Before starting work always disconnect the vehicle battery. Access the lamp from inside the trunk by removing the trim panel to reach the retaining screws and electrical connector. Remove the fasteners, unplug the connector and withdraw the lamp assembly. Transfer bulbs if required and check the condition of the gasket or sealing strip; replace if degraded. Fit the new unit, secure fasteners evenly and reconnect the connector. Reconnect the battery and test all light functions (tail/position, stop, indicator, reverse if applicable). Ensure the lens sits flush and the seal is intact to prevent water ingress. Tighten fasteners to manufacturer torque where specified.

Why This Part Most Often Fails

Tail lamps typically fail due to external factors: impact or collision damage, moisture ingress that leads to corrosion of contacts or bulbs, cracked lenses from stress or heat, and degraded seals that allow condensation. Electrical issues such as corroded connectors or damaged wiring can also cause intermittent operation or complete failure. Regular inspection of seals and electrical contacts helps prevent premature failure.

Compatibility And Fit Notes

This lamp is intended for Citroën C4 Coupé 3-door (first generation). The product is commonly identified and located using OE numbers 9646801777 and 6350T6. When searching or ordering, quoting these codes will increase the chance of finding the correct unit quickly. Verify fitment visually against the damaged/existing part and check bulb types before installation.