Replace a faulty left front door central locking lock with a direct-fit electric unit designed for Citroën C4 5-door first series vehicles. This replacement lock restores reliable locking and unlocking via central locking, key or remote control, and secures the driver’s door against unwanted opening. Ideal for professional workshops and experienced DIYers who search by OEM part numbers such as 9681331680 or 9135Z5.

Function And Benefits

The unit combines the mechanical latch and the electric actuator that operate the central locking for the driver’s door. It converts signals from the central locking module into mechanical movement to lock or unlock the door and also provides the door-ajar monitoring contact. Installing a properly fitting lock eliminates intermittent locking faults, noisy or slow actuators and improves door security.

Typical Symptoms And When To Replace

• Door does not lock or unlock with central locking or key fob while other doors function normally.
• Intermittent operation: sometimes works after tapping the door or after several attempts.
• Loud grinding, buzzing or no sound from the door when trying to lock/unlock.
• Door does not latch properly or remains ajar warning light stays on.

Most Common Causes Of Failure

Failures are usually caused by mechanical wear of internal gears, water ingress and corrosion inside the door, broken plastic components, seized actuator motor, or poor electrical connection at the door harness connector. Frequent use, long-term exposure to moisture and blocked door drain channels accelerate deterioration.

Installation Recommendations

• Before starting work, disconnect the negative battery terminal and follow manufacturer procedures to avoid electrical damage or airbag/comfort system faults.
• Remove the door trim carefully to access the lock mechanism. Peel back moisture barrier only as needed and preserve the sealing tape for reinstallation.
• Support the door handle and locking rods when detaching linkages; note the orientation of clips and rods for correct reassembly.
• Unplug the electrical connector and remove the retaining screws/bolts. Replace the lock with the new unit and refit bolts to the correct torque. Reconnect the wiring and test locking/unlocking operation before resealing the moisture barrier and refitting trim.
• Check and clear door drain holes and lubricate moving parts with an appropriate grease to prolong service life.

Technical Information

• Manufacturer: Stellantis (Citroën/Peugeot)
• Model: Citroën C4, 5-door, First Series (Driver’s Door)
• Product Codes: 9681337180, 9660699880 F03, 9647172780 F03, 9683416080, 9681331680
• Additional Numbers: 9135Z5, 9135FA, 9135R0

Practical Tips For Long-Term Reliability

• Inspect and clean the electrical connector for corrosion; apply dielectric grease to help prevent future corrosion.
• Ensure the moisture barrier is seated correctly to prevent water reaching the lock mechanism.
• If the actuator is noisy but still operating, replacement is recommended before complete failure to avoid being locked out.

This part is suited for technicians and competent DIYers familiar with door trim removal and vehicle electrical systems. Searching by part numbers 9681331680 or 9135Z5 will help find compatible units quickly.

Restore reliable central locking and door security with this electric left front door lock designed for the Citroën C4 (5-door, first generation). Ideal for professional workshops and DIY mechanics, this direct-fit replacement addresses common failures of the driver-side locking mechanism and returns smooth locking/unlocking and key operation. The unit is compatible with multiple OEM reference numbers often used in search queries, making it easy to find by part code. Installation is straightforward for a trained technician and typically resolves issues such as intermittent locking, inability to lock/unlock from the remote, or a stuck door latch.

Benefits

– Direct replacement for driver-side central locking; restores factory functionality.
– Compatible with common OEM codes to simplify part lookup and ordering.
– Designed to integrate with existing door linkages and electrical connector harnesses.
– Useful for garages and experienced DIYers performing door lock repairs or restorations.

How It Works

The unit houses the actuator motor and latch mechanism that operate the central locking for the left front door. When the car’s central locking signal is received (remote or door switch), the actuator moves internal linkages to lock or unlock the latch. Failures usually originate from worn actuator motors, broken plastic gears, corroded contacts, water ingress or mechanical wear inside the latch assembly.

How To Replace

Replacement typically requires standard tools and about 30–90 minutes depending on experience. Basic steps:

• Park vehicle on level surface and ensure ignition is off.
• Remove interior door trim panel (careful with clips and door handle cables).
• Peel back the vapor/moisture barrier to access the lock assembly.
• Disconnect electrical connector and unclip/unscrew linkage rods from the lock.
• Remove the fixing screws/bolts securing the lock to the door and extract the old unit.
• Install the new lock, reconnect linkages and electrical connector, test operation before reassembling the door panel.
• Reinstall vapor barrier and door trim panel, verify central locking and key operation.

Installation Recommendations

– Work In A Clean, Dry Environment To Avoid Introducing Debris Or Moisture Into The Door Cavity.
– Use The Correct Trim Tools To Avoid Damaging Clips And Interior Panels.
– Verify All Linkages Are Correctly Seated And Not Bent; Incorrect Rod Position Can Prevent Proper Latching.
– Test Lock Operation With The Door Open Before Final Reassembly To Confirm Functionality.
– If Electrical Faults Persist, Check Wiring Harness, Connector Pins And Fuse/Central Locking Relay.

Technical Information

• Manufacturer: Stellantis / Citroën
• Model: Citroën C4 (First Generation, 5-Door)
• Product Codes: 9686719880, 9135FA
• Other Numbers: 9681337180, 9660699880 F03, 9647172780 F03, 9683416080, 9135Z5, 9135R0

Most Common Failure Reasons

– Worn Actuator Motor Or Internal Gears: Plastic gears and small motors can degrade over time, causing intermittent or complete failure.
– Corrosion Or Water Ingress: Moisture entering the door can corrode contacts or jam mechanical parts.
– Mechanical Wear Or Damage: Repeated use or impact can bend linkages or damage the latch mechanism.
– Electrical Connector Issues: Loose or corroded pins can interrupt power to the actuator, leading to unreliable operation.

Compatibility And Search Tips

Customers often search by OEM numbers; include the product codes listed above when searching to find the correct replacement. This lock is intended for driver-side (left front) doors of the Citroën C4 5-door first-generation models and matches the listed OEM references.

Note For Technicians

Inspect door alignment and striker condition when replacing the lock—misaligned doors or a worn striker can mimic lock failure and lead to repeated replacements if not addressed.

Product Overview

This electric door lock/central locking actuator is designed for the left front (driver’s) door of the Citroën C4 5‑door first series. It operates the central locking mechanism and the mechanical latch inside the door, allowing remote or central locking commands to lock and unlock the driver’s door. The unit is commonly referenced by multiple OEM numbers, so customers often find it by part number search.

Key Benefits

• Direct replacement for the OEM central locking mechanism on the left front door.
• Restores reliable locking/unlocking and door latching function.
• Saves time for workshops and DIY mechanics by matching common part numbers used across Stellantis models.

How It Works

The actuator converts electrical signals from the central locking system into mechanical movement. It moves internal rods and levers that engage or release the door latch. Failure of the actuator typically results in the door not locking/unlocking with the remote, difficulty opening or closing the door, or intermittent operation.

Installation Procedure (Summary)

• Recommended Tools: Trim removal tools, Torx/Screwdriver set, pliers, ratchet with sockets.
• Preparation: Park vehicle on level ground and ensure ignition is off. It is good practice to disconnect the negative battery terminal before working on door electrics to avoid short circuits or accidental activation of systems.
• Door Trim Removal: Remove armrest screws and door card retaining clips, carefully lift off the door panel. Peel back the moisture/vapor barrier to access the lock mechanism.
• Disconnect: Unplug the electrical connector from the actuator and detach any linkage rods/clips connecting the actuator to the latch and door handle.
• Remove Old Unit: Unscrew the retaining bolts and remove the actuator from the door shell. Note the routing and orientation of linkages for correct reassembly.
• Fit New Unit: Install the replacement actuator, reconnect linkage rods and electrical connector. Refit moisture barrier and test the locking function before reassembling the door card.
• Testing: Verify central locking operation with remote and manual handle, check that the door latches and releases smoothly, and confirm no error messages on instrument cluster.

Most Common Failure Reasons

• Wear Of Internal Gears Or Motor: Repeated use and age can wear plastic gears or the small electric motor inside the actuator.
• Water Ingress And Corrosion: Moisture entering the door cavity can corrode internal components and electrical connectors, causing intermittent or permanent failure.
• Broken Linkage Or Clips: Mechanical rods and plastic clips that connect the actuator to the latch can fatigue or break, preventing proper operation.
• Electrical Connector Issues: Bent pins, loose connector or wiring damage can interrupt power or signal to the actuator.

Technical Information

• Manufacturer: Stellantis / Citroën
• Model: Citroën C4 (1st Series) 5‑Door – Left Front (Driver’s Door)
• Product Codes: 9681337180, 9660699880, 9647172780, 9683416080, 9135Z5, 9135FA, 9135R0
• Additional Numbers: F03 (reference), 9135R0

Compatibility Notes

This unit is intended for the left front driver’s door of Citroën C4 5‑door first series models. It is identified by several OEM numbers commonly used for parts lookup; verify the physical appearance and connector arrangement when replacing to ensure fitment.

Recommendations For Fitment

• Always compare the new part with the removed unit to confirm matching mounting points, linkages and connector type.
• Before final reassembly, test the locking/unlocking cycles and latch engagement to ensure correct installation.
• Lubricate latch contact points with an appropriate grease to reduce wear and prevent future binding.
• If the actuator failed due to water ingress, inspect door seals and drainage channels and repair as needed to prevent recurrence.

Who Should Install

Suitable for experienced DIY mechanics and professional workshops. If unsure about door trim removal or electrical connections, seek assistance from a professional technician.

Product Overview

High-quality electric central locking lock for the left front (driver’s) door, designed for Citroën C4 5-door models of the first series. This replacement lock restores reliable central locking function, improves door security and eliminates common symptoms such as failure to lock/unlock, intermittent operation or noisy actuator movement. Frequently referenced by part numbers 9681337180 and 9135Z5, this unit is a direct-fit replacement for workshop repairs and DIY servicing.

Compatibility And Fit

• Suitable For: Citroën C4 5-door (First Series) — Left Front (Driver) Door
• Commonly Searched By Part Numbers: 9681337180, 9135Z5
• Also Cross-Referenced With: 9660699880 F03, 9647172780 F03, 9683416080, 9135FA, 9135R0

Technical Information

• Manufacturer: Stellantis (Citroën / Peugeot)
• Model: Citroën C4 5-door (First Series) — Left Front Door
• Product Codes: 9681337180; 9660699880 F03; 9647172780 F03
• Other Numbers: 9683416080; 9135Z5; 9135FA; 9135R0

Function And Symptoms

The unit houses the electric actuator and mechanical latch that operate the central locking and door release functions. Typical failure symptoms include: the door not locking or unlocking with the remote, noisy or grinding operation inside the door, inability to open the door from the interior or exterior, and intermittent electrical operation. Replacing the lock restores normal locking/unlocking, secure latching and proper interaction with central locking system.

Installation And Replacement

General replacement steps (for experienced mechanics or competent DIYers):

• Disconnect Battery: Always disconnect the negative terminal before starting work to avoid short circuits and to protect electrical components.
• Remove Door Trim: Carefully detach the interior door panel and any vapor barriers to access the lock assembly. Use appropriate trim tools to avoid damage.
• Disconnect Electrical Connector: Unplug the central locking actuator connector and any wiring harnesses, noting connector orientation and clips.
• Remove Linkages And Fasteners: Detach control rods or cables and remove mounting screws/bolts securing the lock. Keep track of clips and spacers for reassembly.
• Fit New Unit: Install the replacement lock in the correct orientation, reconnect linkages and electrical connector, then test mechanical and electrical operation before reassembling the door card.
• Function Check: Verify locking/unlocking with remote and manual lever, and check child locks and central locking synchronization.

Recommended Tools: Trim removal tools, Torx/Spline drivers or Torx set, ratchet and socket set, needle-nose pliers, and a multimeter for electrical checks. If unsure, have the replacement performed by a qualified mechanic.

Mounting Recommendations

When installing, ensure connectors are fully seated and clips are secured to prevent rattles or intermittent contacts. Inspect wiring and connector pins for corrosion or damage and replace any brittle plastic clips. Apply light dielectric grease to electrical terminals if exposed to moisture. Always test the lock operation before refitting the trim panel to avoid repeat disassembly.

Most Common Failure Causes

• Actuator Wear: Electric motor or internal gears wear out over time, especially in high-mileage vehicles.
• Plastic Gear Damage: Internal plastic components can break, leading to loss of mechanical engagement.
• Water Ingress And Corrosion: Moisture entering the door cavity can corrode electrical contacts and mechanical parts.
• Damaged Linkages Or Cables: Bent or detached rods and worn cable ends prevent proper latch movement.
• Electrical Faults: Connector corrosion, broken wires or intermittent contacts cause unreliable operation.

Notes For Mechanics And DIY Enthusiasts

This lock is a common workshop replacement part and is often searched by its manufacturer codes (e.g., 9681337180, 9135Z5). Inspect surrounding components (door hinges, striker plate, window regulator) when replacing the lock to ensure no additional wear is contributing to door alignment or latching issues.

Replace the faulty left front door lock with this used electric central locking unit designed for Citroën C4 five‑door models (first series). The unit operates the door latch and integrates with the vehicle’s central locking system to ensure secure closing and reliable locking/unlocking from the remote and interior controls. Ideal for professional mechanics and DIY enthusiasts searching by part number (e.g. 9683416080, 9135FA), this replacement restores proper door function and eliminates issues like intermittent locking, door not latching or refusal to unlock.

Technical Information

• Manufacturer: Stellantis / Citroën
• Model: Citroën C4 (First Series) 5‑Door, Left Front (Driver’s) Door
• Product Codes: 9683416080, 9135FA
• Other Numbers: 9681337180, 9660699880 F03, 9647172780 F03, 9135Z5, 9135R0

Installation Recommendation

• Preparation: Disconnect the battery before starting to avoid short circuits and to protect vehicle electronics.
• Removal: Remove the inner door trim and moisture barrier to access the lock assembly. Carefully detach the electrical connector, lock rods and linkage, and unbolt the lock unit from the door shell.
• Fitment: Install the replacement unit in reverse order. Check and, if required, lubricate moving parts and ensure the latch and striker alignment are correct before reassembling the door trim.
• Electrical Check: Verify connector pins are clean and corrosion‑free. After installation, cycle the lock with the remote and interior switch to confirm correct operation.
• Recommendation: Fitment is recommended to be performed by a trained technician if you are not experienced with door disassembly—proper alignment and secure connections are essential for reliable function.

Common Failure Causes

• Mechanical Wear: Internal plastic gears or latch components wear over time and can strip or seize.
• Water Ingress And Corrosion: Moisture entering the door cavity can corrode metal parts and weaken electrical contacts.
• Electrical Faults: Connector corrosion, damaged wiring or a failed actuator motor will prevent locking/unlocking.
• Linkage Damage: Bent or disconnected rods and clips can stop the latch from operating correctly.
• Impact Damage: Door impacts or misalignment from accidents can damage the lock mechanism.

This part is frequently searched by reference numbers—use the product codes listed above when looking for compatibility. Installing a correct, well‑fitting lock restores door security and central locking reliability, reducing noise, rattle and malfunction associated with a failing latch.

Product Overview

This replacement electric door lock is designed for the left front (driver) door of Citroën C4 5‑door (first generation). It restores central locking and mechanical latching functions, delivering reliable closing and secure locking after wear or damage to the original unit. The part is supplied with the standard electrical connector and mechanical latch assembly ready for direct replacement in compatible vehicles.

Who Is This For

Engineers, professional mechanics and competent DIY enthusiasts who perform door-trim removal and basic door-mechanism repairs. The unit is ideal when the door no longer locks or unlocks electrically, when the latch is stiff, or when the internal actuator has failed.

Key Features & Benefits

• Direct fit for left front driver door of Citroën C4 (First Generation) 5‑door.
• Restores Central Locking Functionality And Secure Latching.
• Complete With Electrical Connector And Mechanical Linkages For Fast Replacement.
• Suitable For Workshop Or Garage Replacement — Saves Time Compared To Full Door Replacement.

How It Works

The unit combines a mechanical latch, an electric actuator and position switches. When the central locking signal is received, the actuator moves internal gears and levers to lock or unlock the latch. Position switches inform the vehicle electronics of the latch status (locked/unlocked), enabling proper central-locking feedback and alarm functions.

Replacement Procedure (Overview)

Typical replacement requires moderate skill and common tools:

1. Remove interior door trim and any waterproofing membrane to access the lock assembly.
2. Disconnect the electrical connector(s) and unclip or remove the door handle/lock rods from the latch.
3. Unbolt the latch from the door shell (usually several Torx or hex fasteners) and extract the old unit.
4. Transfer any required linkages or mounting brackets to the new lock if necessary, fit the new unit, reconnect rods and electrical connector, and secure with fasteners.
5. Reinstall door trim, test central locking, mechanical latching and key/remote operation. Adjust rod lengths or striker if the latch does not close smoothly.

Installation Recommendations

• Work On A Cool, Dry Day To Reduce Moisture Risk Inside The Door.
• Wear Gloves To Avoid Damaging Plastic Trim And To Keep Components Clean.
• Keep Small Fasteners And Clips Organised; Some Clips Are Single-Use And May Need Replacement.
• Lubricate Moving Parts With A Suitable Graphite Or Silicone-Based Lube After Installation To Reduce Wear And Noise.
• After Fitting, Cycle The Lock Mechanism Several Times With The Door Open To Verify Smooth Operation Before Final Reassembly.

Most Common Reasons For Failure

• Wear Of Plastic Gears Or Internal Mechanisms Causing Slippage Or Failure To Move.
• Water Ingress And Corrosion Of Mechanical Parts Or Electrical Contacts Inside The Door.
• Broken Or Disconnected Control Rods And Linkages Resulting In Loss Of Mechanical Actuation.
• Sticking Due To Dirt, Lack Of Lubrication Or Misalignment Of The Striker.
• Electrical Faults Such As Failed Actuator Motor Or Poor Connector Contacts.

Technical Information

• Manufacturer: Stellantis / Citroën / Peugeot
• Model: Citroën C4 (First Generation) 5‑Door — Left Front (Driver) Door
• Product Codes: 9647172780, 9135FA, 9135R0
• Additional Numbers: 9681337180, 9660699880, F03, 9683416080, 9135Z5

Notes For Professionals

Confirm mechanical linkages and electrical connectors match the vehicle during installation. If the vehicle exhibits central locking faults after fitting, check door switch feedback and actuator wiring for continuity and proper grounding. Adjust rod lengths and striker alignment if the door does not latch smoothly.

Why Buy This Part

Replacing a faulty door lock with a correct, compatible lock restores security and convenience while avoiding the higher cost of replacing door modules or the entire door assembly. For workshops and independent mechanics this part provides a practical, cost-effective repair option.

Compatibility Reminder

The part is intended for Citroën C4 first generation 5‑door left front applications and cross-references the listed numbers above. Always verify that the part numbers match the vehicle’s requirements before installation.