Overview

This lock set is a practical replacement kit for Citroën C8 owners and professional workshops. The kit includes the Driver Door Lock, Fuel Filler Flap Lock and Ignition Barrel, delivered with one key. The Passenger Door Lock Is Missing in this set, so an additional cylinder will be required if a complete four-door replacement is needed. Product Codes 4162Y4 and 4162Y2 are commonly used when searching for direct-fit parts for C8 and related Peugeot 807 vehicles.

Fitment

• Citroën C8 (Models Sharing The PSA Large MPV Platform)
• Often Compatible With Peugeot 807 (Same Platform)
• Typical Model Years: 2002–2014 (Verify Specific Year/Trim Before Installation)

Function And Common Faults

The set covers three key functions: locking/unlocking the driver door, securing the fuel filler flap and operating the ignition barrel. Typical failure modes include mechanical wear of tumblers/wafers, corrosion and seized cylinders caused by moisture or road salt, broken key blades or worn key profiles, and internal linkage or actuator wear in the door mechanism. Ignition barrels can additionally suffer from worn tumblers causing the key to stick or turn poorly; if the vehicle uses an immobiliser system, a key without the correct transponder will not start the engine.

Installation Recommendations

• Disconnect Battery Before Starting Work To Avoid Short Circuits And To Protect Electrical Systems.
• Driver Door Lock: Remove Door Trim Panel, Disconnect Linkages And Electrical Connectors, Extract Lock Cylinder Retaining Screws Or Clips, Fit New Cylinder And Reconnect Linkages. Adjust Rods And Lock Mechanism For Smooth Operation.
• Ignition Barrel: Remove Steering Column Covers, Withdraw Barrel Retaining Screw Or Clip, Slide Out Old Barrel And Replace With New Unit. Reassemble Covers And Verify Steering Lock Function.
• Fuel Filler Flap Lock: Access Via Wheel Arch Liner Or Trunk Depending On Vehicle Layout, Remove Retaining Fasteners, Replace Lock Cylinder And Seal Against Moisture Ingress.
• Lubrication: Use Dry Graphite Or Silicone-Based Lock Lubricant; Avoid Petroleum Oils That Attract Dirt.
• Keying: The Supplied One Key Will Operate The Included Cylinders If They Are Factory-Matched. If Locks Are From Different Sets, Cylinder Reprofiling Or Rekeying May Be Required.
• Final Check: Verify Locking/Unlocking, Central Lock Function (If Applicable) And Ignition Operation Through Several Cycles Before Reassembling Panels.

Technical Information

• Manufacturer: Stellantis (Citroën/Peugeot OEM)
• Model: Citroën C8 / Peugeot 807
• Product Codes: 4162Y4, 4162Y2
• Additional Numbers: N/A

Why This Part Fails Most Often

Locks and ignition barrels are subjected to constant mechanical stress and environmental exposure. The most frequent causes of failure are worn internal tumblers from long-term use, corrosion from water and salt exposure, broken or bent keys, and physical damage from attempted theft or accidents. Poor lubrication and ingress of debris accelerate wear and can cause sticking or jamming of the cylinder.

Recommended For Whom

Suitable For Professional Mechanics And Experienced DIY Enthusiasts Who Are Comfortable With Door Trim Removal And Steering Column Disassembly. Ideal When Replacing Worn Or Damaged Lock Cylinders On Citroën C8 And Equivalent Peugeot 807 Vehicles.

Note On Keys And Immobiliser

One Key Is Supplied With This Set. If The Vehicle Uses A Transponder Immobiliser, The Key May Require Programming Or Cloning To Start The Engine; Mechanical Operation Of The Locks Does Not Guarantee Immobiliser Compatibility.

Purchase Advice

If You Need A Direct-Fit Replacement For The Driver Door, Fuel Flap And Ignition Barrel On A Citroën C8 Or Peugeot 807, This kit Provides Core Components For A Fast Repair. Check Product Codes 4162Y4 And 4162Y2 When Searching For Matching Items And Plan For An Additional Passenger Door Cylinder If You Require A Complete Set.

Overview

This complete lock set is designed for Citroën C8 and is also compatible with Peugeot 807. The kit covers the main access points: driver door lock, passenger door lock, fuel filler flap lock and the ignition switch housing (ignition barrel). Two keys are supplied with the set. The ignition barrel wiring already has the immobilizer wires connected — these wires must be joined correctly during installation to restore immobilizer function.

Why Choose This Lock Set

Ideal for professional workshops and experienced DIY mechanics, this kit allows a full replacement of worn or damaged locks in one service operation. Listing the common parts together reduces diagnostic time and simplifies parts ordering — many customers search directly by codes such as 4162Y4 and 4162Y2. The set is suited for vehicles where individual locks show mechanical wear, corrosion or electrical faults in the central locking/immobilizer wiring.

Technical Information

• Manufacturer: Stellantis / Citroën / Peugeot
• Model: Citroën C8, Peugeot 807
• Product Codes: 4162Y4, 4162Y2
• Additional Numbers: 4162y44

Function And Common Faults

Door and fuel flap locks provide mechanical security and, where fitted, electrical signals to the central locking system. The ignition switch housing contains the barrel where the key turns the ignition and interfaces with the vehicle immobilizer. Typical failure modes include mechanical wear of tumblers and linkages, plastic component fatigue, corrosion from moisture ingress, actuator failure in central locking systems, and wiring faults or poor splices affecting immobilizer communication.

How Replacement Is Performed

Replacement should be performed by an experienced mechanic or a competent DIYer with basic tools. Typical steps include:

• Disconnect the negative battery terminal before starting work to avoid short circuits and electronics damage.
• Remove interior door trim panels and protective covers to access the lock mechanisms and linkages.
• Disconnect electrical connectors and central locking actuator plugs where present; note connector positions for reassembly.
• Unbolt the lock units from the door or fuel flap and carefully free the mechanical linkages and rods.
• Install the new locks in reverse order, ensuring linkages operate freely and electrical connectors are secure.
• For the ignition switch housing, remove steering column covers to access the barrel. Reconnect immobilizer wiring as required (see note below).
• Verify mechanical operation of all locks, central locking function and that keys turn smoothly; test locking and unlocking cycles before refitting trim.

Installation Recommendations

• Always Disconnect The Battery Before Starting Work.
• Use Correct Tools To Avoid Damaging Plastic Clips And Trim.
• Lubricate New Locks With Graphite Or Suitable Lock Lubricant To Extend Service Life.
• Secure All Electrical Connections And Insulate Any Splices Properly To Prevent Corrosion.
• Check Mechanical Linkages For Wear Or Bending — Replace Any Damaged Rods Or Clips.
• After Installation, Perform Several Lock/Unlock Cycles And Start The Engine To Confirm Immobilizer And Ignition Function.

Immobilizer Note

The immobilizer wiring has been connected to the ignition switch housing in this set. During installation the immobilizer wires must be correctly joined and insulated. Depending on the vehicle and key status, key programming or synchronization may be required after mechanical reconnection to restore full immobilizer functionality.

Reason Why The Part Most Frequently Fails

Locks and ignition barrels commonly fail due to long-term wear of internal tumblers and linkages, ingress of moisture leading to corrosion, broken plastic parts from repeated use, or electrical faults in actuator wiring. Repeated forceful operation, exposure to road salts and lack of lubrication accelerate wear. Ignition barrels additionally suffer from key wear and metal fatigue in the tumbler mechanism.

Compatibility And Search Tips

Mechanics and DIY enthusiasts frequently search by product codes — 4162Y4 and 4162Y2 — so using these references in orders will speed identification. Compatible With Citroën C8 And Peugeot 807 Applications As Stated Above.

Product Overview

Complete lock set designed for Citroën C8 containing driver and passenger door locks, fuel flap lock and an ignition barrel supplied with one key. Ideal for workshops and DIY mechanics who need a direct replacement of mechanical locking components or a matched set when replacing worn or damaged locks. Relevant search keywords: Citroën C8 door lock set, ignition barrel C8, 4162Y4, 4162Y2, Peugeot 807 locks.

Technical Information

• Manufacturer: Stellantis / Citroën / Peugeot
• Model: Citroën C8 (first series); compatible with Peugeot 807 (first series)
• Product Codes: 4162Y4, 4162Y2
• Additional Numbers: NFP

Function And What Is Included

This kit replaces the mechanical locking points that secure the doors and fuel filler flap and restores the ignition barrel function. The door locks operate the latch and central locking mechanism; the fuel flap lock secures the filler door; the ignition barrel houses the mechanical key interface and may contain the barrel components that engage the steering lock and starter switch when turned.

Typical Faults And Failure Causes

• Mechanical Wear: Tumblers, springs or plastic components inside locks wear over time, causing sticking, difficulty turning the key or failure to lock/unlock.
• Corrosion And Moisture Ingress: Water or salt can corrode internal parts, especially in door locks and fuel flap lock, leading to seized mechanisms.
• Key Wear Or Damage: Worn or bent keys cause poor engagement with the barrel and accelerated wear of tumblers.
• Impact Or Forced Entry: Physical damage from attempted break-ins or slammed doors can break linkages or locking tabs.
• Central Locking Actuator Issues: Symptoms that appear like a lock failure can sometimes be caused by failed actuators or linkages rather than the lock cylinder itself.

Installation Recommendations

Recommended for experienced mechanics and competent DIYers. General replacement steps:

• Always work with the ignition off and the vehicle secured. For ignition barrel work, disconnect the battery before starting to reduce risk of short circuits and avoid accidental airbag deployment.
• Remove interior door trim panels to access door lock mechanisms—take care with clips and wiring for speakers/locks.
• Disconnect electrical connectors and detach linkages carefully; note their routing and attachment points for reassembly.
• For the ignition barrel, remove steering column covers to access the retaining screw or clip; withdraw the old cylinder and fit the new barrel in correct orientation.
• Fit locks in reverse order, lubricate moving parts with a suitable lock lubricant, and check mechanical travel and engagement before reassembling trim.
• If the supplied key contains a transponder, key programming or synchronization with the vehicle immobilizer may be required. Use appropriate diagnostic or key programming equipment if needed.

Why Replace The Whole Set

Replacing the complete set of locks and the ignition barrel at once ensures consistent keying and reduces repeated disassembly of door trims and steering column. One matched key for all locks simplifies daily use and avoids multiple keys for the same vehicle.

Buying Advice

Search by product codes (4162Y4, 4162Y2) when looking for a direct fit. This kit is aimed at Citroën C8 first-series vehicles and is commonly cross-referenced with early Peugeot 807 models that share the same platform and locking components.

Final Notes

Fitment depends on vehicle specification and production variant—verify compatibility by matching part codes and visual comparison with the existing components before installation. After fitting, check all locks and the ignition function for smooth operation and complete locking/unlocking cycles.