Description
Lock set for Citroën C4 II (B7) vehicles. Driver door lock plus ignition barrel. 2 x key
High-quality lock set designed for workshop use and competent DIY mechanics who maintain Citroën vehicles. This kit includes the driver door lock mechanism together with the ignition barrel and two keys, offering a complete replacement solution when the original lock or ignition tumbler becomes worn or damaged. The set is especially useful when the lock shows mechanical failure, the key no longer turns smoothly, or the ignition switch is intermittent. Many customers search by product codes 9801984780 or 4162PT, so these references are included for fast identification.
Function And Benefits
The driver door lock secures the door latch and houses the actuator and electrical switch that communicates with central locking. The ignition barrel houses the mechanical tumblers and the electrical contacts for the ignition switch. Replacing both components together restores reliable locking, theft deterrence and ignition operation. Benefits include:
- Complete replacement of mechanical and ignition components in one kit.
- Includes two keys for immediate operation and spares for programming/cutting.
- Improved reliability of door locking and ignition switching.
- Direct fit for the specified Citroën C4 II (B7) application.
Replacement Procedure
Replacement should be performed by an experienced technician or an experienced DIYer with the appropriate tools. Typical steps:
- Disconnect the vehicle battery before starting work to prevent short circuits and to protect electronic components.
- Door Lock: Remove inner door trim and water shield. Detach rods and electrical connectors from the lock mechanism. Unscrew the lock body from the door and fit the new unit, reconnecting rods and connectors and checking latch alignment.
- Ignition Barrel: Remove steering column covers, unlock retaining screws and disconnect ignition switch connectors. Withdraw the old barrel and install the new one, ensuring correct mechanical alignment and that the key turns freely.
- Reassemble trims, reconnect the battery and test central locking, door operation and ignition function.
Key And Immobilizer Notes
The kit includes two keys. Keys Will Usually Need To Be Cut To Match The New Barrel. In Vehicles With An Immobilizer, Transponder Keys May Require Programming Or Adaptation To The Vehicle Immobilizer System. Programming Often Requires Specialist Key Cutting And Diagnostic Equipment.
Installation Recommendations
- Always Disconnect The Battery Before Starting Work.
- Use Proper Fasteners And Torque Settings When Reinstalling The Lock And Steering Column Covers.
- Do Not Lubricate The Ignition Tumblers With Oil; Use Graphite Or Manufacturer‑Approved Lock Lubricant If Necessary.
- If Key Transponder Programming Is Required, Have Keys Cut And Programmed By A Qualified Locksmith Or Dealer With The Appropriate Equipment.
- After Installation, Check Central Locking, Manual Locking, All Key Positions (Accessory/On/Start) And Ensure The Steering Lock Operates Correctly.
Why This Part Fails
Typical failure modes include mechanical wear of tumblers and latch components, corrosion from moisture ingress, broken or bent lock rods, and electrical wear or failure of the lock actuator or ignition switch contacts. Frequent use, forced entry attempts and accumulation of dirt or rust accelerate deterioration. Keys That Become Worn Or Bent Can Also Cause Premature Failure Of The Barrel.
Technical Information
- Manufacturer: Citroën (Stellantis)
- Model: C4 II (B7)
- Product Codes: 9801984780, 4162PT
- Other Numbers: 4162PT
Recommended Tools And Additional Tips
Basic mechanic’s tools, Torx and metric sockets, panel trim tools, and a calibrated torque driver are usually sufficient. For ignition and immobilizer work, diagnostic equipment capable of key programming is recommended. Always Follow Manufacturer Procedures For Disassembly To Avoid Damaging Trim Clips Or Electrical Connectors.
