Description
Lock set for CITROËN C4 II B7 vehicles
Driver’s door lock plus ignition switch barrel
2 x Key
Product Overview
This lock set is designed for Citroën C4 II (B7) platforms and provides a direct replacement for the driver’s door locking mechanism and the ignition switch barrel. The kit includes two keys and is ideal for professional workshops and skilled DIY mechanics who need a reliable, OEM-fit solution for worn or damaged locks. Part numbers 9801984780 and 4162PT are commonly used when searching for compatibility and spare parts.
Features And Function
The assembly restores mechanical locking and ignition functions: the driver’s door lock secures the door latch and integrates with the central locking system, while the ignition switch barrel houses the mechanical key and the electrical ignition switch contact. When correctly installed, the set allows normal door locking/unlocking and engine start operations using the supplied keys.
Technical Information
Manufacturer: Stellantis (Citroën)
Model: Citroën C4 II (B7)
Product Codes: 9801984780, 4162PT
Additional Numbers: 4162PT, 9801984780
What Is Included
1 x Driver’s Door Lock Assembly
1 x Ignition Switch Barrel / Ignition Lock
2 x Key
Replacement Procedure (General Guide)
Disconnect the vehicle battery before beginning work to avoid short circuits and to protect onboard electronics. For the door lock: remove the inner door trim and any vapor barriers, detach the linkages and electrical connectors, unbolt the lock assembly and replace with the new unit, then reconnect linkages and test mechanical and central locking functions. For the ignition barrel: remove steering column covers, release locking screws or retaining clips, withdraw the old barrel and fit the new one, reassemble steering column trim and verify key operation. Always follow the vehicle manufacturer’s detailed repair manual and torque specifications.
Installation Recommendations
Perform Installation In A Dry, Clean Workspace. Use The Correct Tools To Avoid Damaging Fasteners Or Trim. Always Disconnect The Battery Before Removal And Reconnection. After Installing The Mechanical Parts, Verify Central Locking And Ignition Operation. If Keys Contain A Transponder, Immobilizer Programming Or Key Adaptation May Be Required Using Manufacturer Diagnostic Tools.
Why This Part Fails Most Often
Common failure modes include wear of internal tumblers and wafers due to prolonged use, key damage or deformation, corrosion from moisture ingress, forced entry or vandalism, and mechanical breakage of linkages inside the lock assembly. In ignition barrels, repeated use with a worn key or debris accumulation can cause binding or failure to turn.
Notes For Professionals And DIY Mechanics
Searches For This Part Are Frequently Performed Using Product Codes 9801984780 And 4162PT—include those codes in catalogs and ordering systems to speed identification. When Replacing Locks On Vehicles With Immobilizer Systems, Be Prepared That Keys May Require Programming Or Adaptation To The Vehicle’s Security System; Use Appropriate PSA Diagnostic Equipment For Key Registration If Needed.
