Used rear fog lamp specifically for the Citroën C4 Coupe (3-door, first generation). Supplied with the bulb and a short section of wiring for a direct fit — a practical replacement for workshops and home mechanics. The assembly restores rear fog illumination to OEM standard, improving safety in poor visibility and ensuring correct fitment under original part numbers.

Description And Function

The rear fog light increases vehicle visibility in fog, heavy rain or snow by providing a high-intensity red beam at the rear of the car. This left-side unit is a complete housing with lens, bulb holder and attached wiring piece, ready to be installed in place of a damaged or non-functioning lamp. It is an OEM-fit component with mounting points designed for the Citroën C4 Coupe bodywork.

How To Replace

• Prepare Tools: Torx/Phillips screwdrivers, trim removal tools, protective gloves.
• Safety First: Disconnect the negative battery terminal before starting work.
• Access: Depending on vehicle trim, remove the trunk interior trim or access panel behind the lamp to reach the mounting screws and connector.
• Removal: Unscrew the lamp retaining bolts, carefully unplug the bulb connector and remove the old unit from the bumper aperture.
• Fitment: Connect the supplied wiring piece to the vehicle harness, insert the lamp into the aperture, and secure with the original fasteners.
• Test: Reconnect the battery, verify operation of the fog lamp, and check alignment. Replace interior panels.

Installation Recommendations

• Always Disconnect The Battery Before Removal And Installation.
• Use Dielectric Grease On Electrical Connectors To Prevent Corrosion And Improve Contact.
• Avoid Touching The Glass Of Halogen Bulbs With Bare Hands; Contaminants Shorten Bulb Life.
• Check Mounting Points And Seals For Damage; Replace Any Broken Clips To Ensure Proper Sealing Against Moisture.
• After Installation, Verify Light Operation And Beam Position To Comply With Road Safety Regulations.

Why This Part Fails Most Often

• Moisture Ingress: Broken seals or cracked lenses allow water to enter, causing corrosion and electrical faults.
• Impact Damage: Rear collisions or bumper impacts often physically damage the housing or mounting tabs.
• Bulb Failure: Bulbs have a finite life and will burn out; vibration and heat cycles reduce lifespan.
• Connector Corrosion Or Wiring Damage: Salt, dirt and mechanical wear can degrade the connector or wiring, causing intermittent or permanent failure.

Technical Information

• Manufacturer: Citroën (Stellantis)
• Model: Citroën C4 Coupe (3-Door) – First Series (C4 I)
• Product Codes: 9652736480, 6350T7
• Additional Numbers: 6350.T7

This used rear fog light is a cost-effective way to restore functionality and safety to your Citroën C4 Coupe. Supplied with bulb and wiring piece for straightforward replacement — suited for professional garages and competent DIY mechanics who require an OEM-compatible part by part number.

Product Overview

High-quality replacement right rear fog lamp designed for Citroën C4 Coupe (3‑door). This unit includes the bulb and a short piece of wiring for straightforward fitment. It is a direct-fit spare part commonly sought under OEM codes 9652736380 and 6351T7, making it easy to find when repairing or restoring rear light functionality.

Why Choose This Fog Light

• Direct replacement for the original passenger‑side rear fog lamp on C4 Coupe (first generation).
• Supplied Complete With Bulb And Short Cable For Faster Installation.
• OE Reference Numbers Included In Listing For Fast Search And Compatibility.
• Suitable For Professional Workshops And DIY Enthusiasts.

Fitment And Compatible Models

Fits Citroën C4 Coupe (3‑door), first generation (C4 I). Common model years: 2004–2010. Always verify the lamp location (right/passenger side) and the OEM part number to ensure correct match.

How The Part Is Replaced

Typical replacement steps for a rear fog lamp on a C4 Coupe:

1. Open the boot and remove the interior trim or access panel on the passenger side to reach the rear lamp housing.
2. Disconnect the electrical connector and remove any retaining screws or clips holding the lamp assembly.
3. Extract the old lamp assembly, unclip or remove the bulb holder if necessary, and compare the new unit to confirm match.
4. Fit the new lamp assembly, connect the supplied cable and bulb, and secure the unit with the original fasteners.
5. Test the fog light operation before refitting the interior trim. Ensure correct sealing to prevent moisture ingress.

Common Failure Modes — Why This Part Usually Fails

• Bulb Burnout: The simplest and most frequent cause — bulbs have a limited service life depending on usage.
• Water Ingress And Condensation: Damaged seals or impact can allow moisture into the lamp body, causing corrosion or short circuits.
• Connector Corrosion Or Wiring Damage: Corroded contacts or damaged wiring loom can interrupt the circuit or cause intermittent operation.
• Impact Damage: Rear bumper impacts or minor collisions commonly crack or displace the lamp housing.

Installation Recommendations

For best results, inspect the lamp housing seals and wiring harness when replacing the fog lamp. Replace brittle seals and clean corroded connectors, using contact cleaner and dielectric grease where appropriate. After installation, verify correct light function and beam alignment. If the lamp shows signs of water damage or connector corrosion, address the root cause to avoid repeated failures.

Technical Information

• Manufacturer: Stellantis (Citroën)
• Model: Citroën C4 Coupe (3‑door) – First Generation (C4 I, 2004–2010)
• Product Codes: 9652736380, 6351T7
• Additional Numbers: 6351T7 | 9652736380

Notes For Mechanics And DIYers

This rear fog lamp is aimed at professional mechanics and experienced DIYers who maintain Citroën C4 Coupes. Use OE part numbers for quick identification and always check the physical fit and connector type before final assembly. Replacing the lamp promptly when faulty restores visibility in poor weather and ensures compliance with road safety regulations where rear fog lights are required.

Product Overview

High‑quality used right rear tail light designed for Citroën C4 Coupe (3‑door). Ideal for professional workshops and DIY mechanics who search by OE numbers: 9646801677 and 6351T6. This unit is supplied without the bulb holder (socket) but includes the bulbs, making it a direct visual and functional replacement in most cases. The robust housing restores rear lighting functionality and vehicle appearance after damage or wear.

Key Features

• Direct Fit For Citroën C4 Coupe (3‑Door)
• Includes Bulbs; Socket Not Included
• OEM Reference Numbers: 9646801677 / 6351T6
• Suitable For Fast Replacement In Workshop Conditions

Technical Information

• Manufacturer: Citroën (Stellantis)
• Model: Citroën C4 (First Generation) Coupe 3‑Door
• Product Codes: 9646801677, 6351T6
• Additional Numbers: 6351T6 | 9646801677

Installation Recommendations

• Park The Vehicle Safely And Work On A Cold, Stable Surface.
• Access The Lamp From The Trunk: Remove Inner Trim Panels To Reach Mounting Screws Or Nuts.
• Unscrew Mounting Fasteners And Carefully Pull The Lamp Assembly Outwards To Avoid Breaking Mounting Tabs.
• Disconnect The Electrical Connector. Inspect Connector Pins For Corrosion Or Damage.
• Note: This Unit Is Supplied Without The Bulb Holder (Socket). Fit The Original Socket If Intact Or Replace With A Compatible Socket Before Installing If Required. Bulbs Are Included—Verify Bulb Types And Seating.
• Reinstall The Assembly, Tighten Fasteners To Manufacturer Torque Where Specified, And Check Alignment And Seal Integrity.
• Test All Light Functions (Brake, Tail, Indicator, Reverse If Applicable) Before Closing Trim Panels.

Why This Part Fails Most Often

Tail lights typically fail due to mechanical damage, water ingress, electrical contact corrosion, or aging components. Common causes include:

• Impact Damage From Minor Collisions Or Bumps Leading To Cracked Lens Or Broken Mounting Tabs.
• Moisture Ingress Causing Fogging, Short Circuits, Or Corroded Contacts.
• Vibration And Heat Cycles That Wear Bulb Filaments Or Damage Internal Wiring.
• Degraded Seals Or Gaskets Allowing Dirt And Water Into The Housing.

Maintenance Tips

• Inspect Tail Lights During Routine Service Intervals For Cracks, Condensation, And Secure Mounting.
• Replace Gaskets Or Seals When Replacing The Lamp To Prevent Future Moisture Problems.
• Use Dielectric Grease On Electrical Connectors To Reduce Corrosion Risk.
• Verify Bulb Types And Replace With Correct Wattage/Replacements To Avoid Overheating.

This replacement tail light is a practical and cost‑effective solution to restore rear lighting functionality and vehicle safety on Citroën C4 Coupe models. Search By OE Numbers 9646801677 And 6351T6 For Fast Identification.

This replacement rear lamp socket is designed for the right-hand tail light on Citroën C4 3-door Coupe models. It is an ideal part for professional workshops and independent mechanics performing lamp repairs or wiring fixes. The socket comes with part of the wiring harness and retains the bulb holders, which makes it a practical solution when the original connector is corroded, melted or the wiring insulation is damaged. Commonly searched by part numbers 9646801677 and 6351T6 — include these codes in your search to find the exact match quickly.

Technical Information

• Manufacturer: Stellantis / Citroën
• Model: Citroën C4 I Coupe (3-Door)
• Product Codes: 9646801677, 6351T6
• Additional Numbers: 6351T6 | 9646801677

How The Part Works And Why It Fails

The lamp socket holds and connects the rear bulbs to the vehicle wiring, ensuring power and a secure mechanical fit. Over time these sockets commonly fail due to corrosion from moisture ingress, heat damage from high-wattage bulbs or poor contacts causing increased resistance and local heating. Mechanical damage, cracked plastic or worn pins in the connector also lead to intermittent or complete loss of lighting function.

Replacement Frequency

There is no fixed service interval for a tail lamp socket. Failure usually occurs gradually and depends on environmental exposure, quality of previous repairs and the bulb type used. In practice, sockets may last many years but should be inspected if you experience flickering lights, intermittent operation or visible corrosion.

Installation Recommendation

Recommended For Experienced Mechanics And Competent DIYers. Typical Replacement Steps:

• Remove Interior Trim In The Boot/Trunk To Access The Tail Lamp Assembly.
• Unscrew And Withdraw The Lamp Cluster From The Body.
• Unplug The Wiring Harness Connector And Remove The Old Socket From The Lamp Housing.
• Fit The New Socket Into The Lamp Housing, Reconnect The Wiring And Secure Any Clips Or Seals.
• Test All Bulb Functions (Stop, Tail, Indicator, Reverse If Applicable) Before Reassembling Trim.

Always Disconnect The Battery If You Will Be Working On Live Circuits Or Cutting/Wiring The Harness To Avoid Short Circuits. Ensure Sealing Surfaces Are Clean And Use Dielectric Grease On Contacts If Needed To Reduce Future Corrosion.

Most Common Cause Of Failure

Corrosion And Heat Damage Are The Primary Causes. Water Entry Through Damaged Seals Or Cracked Lenses Leads To Oxidation Of Pins, While Repeated Thermal Cycling From Bulb Heat Causes Plastic Deformation And Contact Loss.

Part Numbers And Clear Identification Make Ordering Faster — Use 9646801677 Or 6351T6 When Searching. This Socket Is Supplied With A Section Of Wiring To Simplify Replacement And Reconnection.

This genuine OE third brake light (center high‑mount stop lamp) is a direct replacement for a range of Citroën models and is commonly searched for by its part numbers. It restores correct signalling and visibility at the rear of the vehicle, improving safety and ensuring compliance with road regulations. Ideal For Professional Mechanics And Enthusiast DIYers Who Need A Reliable, Plug‑In Replacement Part.

Key Benefits

Direct Fit For Specified Models: Designed To Match The Original Mounting Points And Connector Types, Reducing Installation Time. Clear Identification By OEM And Alternative Part Numbers Makes This Product Easy To Find In Catalogs And Search Engines. Durable Construction: Built To OEM Standards With Proper Sealing To Resist Road Vibration And Typical Environmental Exposure.

How It Works And When To Replace

The Third Brake Light Houses LEDs/Light Elements And Serves As A Center High‑Mount Stop Lamp (CHMSL), Providing An Additional Brake Signal Visible To Vehicles Behind. It Should Be Replaced If The Light Fails To Illuminate, If The Lens Is Cracked Or Distorted, Or If There Is Evident Water Ingress Or Corrosion At The Connector. Always Inspect The Supply Cable And Connector Before Replacing The Lamp—A Faulty Wiring Harness Or Damaged Connector Can Cause A New Unit To Appear Defective.

How To Replace (Typical Procedure)

• Park The Vehicle On A Level Surface And Disconnect The Battery Before Starting Work.
• Access The Lamp From Inside The Tailgate/Rear Hatch By Removing Interior Trim Panels Or Fasteners.
• Disconnect The Electrical Connector And Remove Securing Screws Or Clips Holding The Lamp To The Tailgate.
• Swap The Old Lamp For The New Unit, Reconnect The Electrical Connector, Seal Any Grommets If Needed, And Refit Interior Trim.
• Reconnect The Battery And Verify Full Function Of Brake Lights (Brake Pedal Depressed And Handbrake/Lighting Checks Where Applicable).

Technical Information

• Manufacturer: Stellantis (Citroën / Peugeot)
• Model: Citroën C4, Citroën C4 Cactus, DS4, Citroën C5 X7 (Select Generations/Body Types As Listed)
• Product Codes: 9689043280, 89093324, 89093538
• Other Numbers: 6350V2, 6351HH, 6351EY, 9688835380 (Reference / Cross Numbers)

Installation Recommendations

Always Disconnect The Battery Before Removing Or Installing The Lamp To Prevent Short Circuits And Protect Vehicle Electronics. Check The Condition Of The Supply Cable, Connector Pins, And Grommets; Clean Corroded Contacts Or Replace Damaged Wiring. Use Correct Torque On Fasteners And Ensure The Lamp Sits Flush To The Tailgate To Maintain Sealing Against Moisture. After Fitting, Test The Brake Light Function With An Assistant Or Use A Diagnostic Light Tool.

Why This Part Commonly Fails

Typical Causes Of Failure Include Water Ingress Through A Damaged Lens Seal Or Gasket, Corrosion Or Oxidation Of The Electrical Connector, Impact Damage To The Lens Or Housing, And Internal LED Or Circuit Board Failures Due To Vibration Or Thermal Stress. In Many Cases, The Underlying Cause Is A Compromised Wiring Harness Rather Than The Lamp Itself—Inspect Wiring Before Replacing The Unit.

Part Numbers And Clear Model References Improve Searchability In Online Stores And Spare‑parts Catalogs—If You Regularly Search By OEM Code, Use Any Of The Numbers Listed Above To Locate This Exact Fitment.

Product Description

This centre high-mount stop lamp (third brake light) is a direct-fit replacement unit designed for Citroën passenger cars listed below. It restores rear signalling visibility and brake light compliance, improving safety during braking and reducing the risk of rear-end collisions. The unit matches original Stellantis mounting points and electrical connector layout for straightforward replacement.

Compatibility

Compatible Models: Citroën C4 I, Citroën C4 II, Citroën C4 Cactus, Citroën DS4, Citroën C5 X7. Always check the part numbers against your vehicle equipment level and production year to ensure correct fitment.

How To Replace

Replacement is suitable for experienced DIYers and professional garages. General procedure: remove interior tailgate/boot trim to access the lamp assembly, undo retaining screws or fasteners, disconnect the electrical connector, remove the old lamp and clean the mounting area, fit the new lamp and secure with original fasteners, reconnect the wiring and test all light functions (brake, tail, and any integrated LED functions). Ensure sealing surfaces are clean to prevent water ingress. Before starting, disconnect the vehicle battery to avoid short circuits or electrical damage.

Most Common Failure Reasons

Typical causes of failure include water ingress and corrosion of contacts, damaged supply cable or connector, mechanical impact to the rear hatch, and internal LED or filament failure. Wiring abrasion or poor sealing around the tailgate can accelerate failure. Regular visual inspection of the connector and seal can prevent premature issues.

Technical Information

• Manufacturer: Stellantis
• Model: Citroën C4 I / C4 II / C4 Cactus / DS4 / C5 X7
• Product Codes: 9646804580, 6350V2, 6351HH, 6351EY
• Other Numbers: 6350.V2, 6351.EY, 6351.HH

Installation Recommendations

Use original-style fasteners and avoid over-tightening to prevent cracking the housing. Check the condition of the wiring harness and replace any brittle or corroded terminals. After installation, verify operation of the brake light from inside the vehicle and with an assistant outside, and ensure the tailgate closes without pinching the cable. If unsure about access or connector condition, have the replacement performed by a professional technician.

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.

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.

Product Overview

This third/centre brake light (high mounted stop lamp) is designed for Citroën C4 Coupé (first generation, C4 I). It improves rear visibility and complements the main brake lamps to increase safety during braking. The unit is a direct-fit replacement for vehicles that use the original equipment referenced by the codes listed below.

Technical Information

• Manufacturer: Stellantis / Citroën
• Model: Citroën C4 Coupé (First Generation, C4 I)
• Product Codes: 9650812280
• Additional Numbers: 6351V2, NFP

Compatibility And Notes

Primarily intended for Citroën C4 Coupé (C4 I). Compatibility is typically determined by matching the product codes above. Before fitting, visually inspect the vehicle connector and wiring loom to ensure the original supply cable is intact — a damaged input cable can prevent the lamp from functioning even if the unit itself is good.

Installation Recommendations

Recommended basic procedure for mechanics and experienced DIYers:

• Open the boot and remove the trim or parcel shelf to access the lamp from inside the boot opening.
• Disconnect the electrical connector and remove any retaining screws or clips securing the lamp.
• Carefully extract the old unit, noting seal placement and wiring routing.
• Fit the replacement lamp, ensure the sealing surface is clean and the gasket is properly seated to prevent water ingress.
• Reconnect the electrical connector, secure the lamp, reassemble trim and test the lamp function with ignition on.
• When working on electrical components, it is recommended to disconnect the battery or follow vehicle manufacturer safety procedures.

Why This Part Most Commonly Fails

Common failure causes include:

• Water Ingress And Corrosion: Leaks or degraded seals allow moisture to reach contacts or the internal circuit, causing intermittent failure or complete loss of function.
• Connector Or Wiring Damage: Chafed, broken, or corroded supply cables and connectors prevent power delivery to the lamp. The original long description warns to check the supply cable before purchase.
• Impact Or Body Damage: Rear impacts or pressure on the boot lid/window area can crack the housing or dislodge the lamp.
• Electrical Faults: Internal driver or bulb/LED failures (depending on variant) can occur over long service life or due to voltage spikes.

Practical Tips

• Always Inspect The Wiring And Connector Pins For Corrosion Before Fitting A New Unit.
• Apply A Small Amount Of Dielectric Grease To Connector Pins To Reduce Future Corrosion.
• Ensure Proper Sealing To Prevent Water Entry—this Extends Service Life.
• After Installation, Verify Stop Lamp Operation From The Rear And Have An Assistant Press The Brake Pedal To Confirm Correct Function.

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.