Description
Ignition barrel, driver door lock and one key for CITROËN PEUGEOT vehicles. It is from a PEUGEOT 407.
This complete lock set combines the ignition barrel, driver door lock and a single key — a practical replacement for workshops and DIY mechanics working on Peugeot and Citroën models. The set is suitable for physical replacement when the original lock shows mechanical wear, the key is damaged, or when one-piece lock sets are preferred to ensure matching tumblers and smooth operation. Supplied as a ready-to-fit unit, it reduces time spent aligning separate components and prevents key mismatch issues.
Key Benefits
– Direct physical replacement of ignition and driver door lock with matched key to restore secure locking and starting function.
– Saves time compared with replacing individual components and rekeying separately.
– Useful for vehicles where the lock barrel is seized, key is worn or broken, or door lock mechanism is damaged.
Technical Information
- Manufacturer: Stellantis (Peugeot / Citroën)
- Model: Peugeot 407 (original fitment). May be compatible with certain Peugeot/Citroën platforms; check vehicle specifics before installation.
- Product Codes: 4162EA, 4162SP, NFP
- Additional Numbers: 4162EA / 4162SP / NFP (as listed)
Function and When To Replace
The ignition barrel controls mechanical engagement of the ignition switch and, together with the driver door lock, secures vehicle access. Typical symptoms indicating the need for replacement include stiff or stuck key, difficulty turning to start, key breaking in the lock, or inability to lock/unlock the driver door. Replacing the complete set with a matching key ensures consistent mechanical operation and reduces the risk of future key-related failures.
Installation Recommendations
- Disconnect the negative battery terminal before beginning work to avoid electrical short circuits and to protect electronic modules.
- Remove steering column covers to access the ignition barrel. Carefully unclip or unscrew trim panels to avoid breaking plastic fasteners.
- Unfasten the retaining screws or clips of the ignition barrel and gently withdraw it from the column. Unplug any electrical connectors for the ignition switch or immobilizer sensor.
- For the door lock, remove the door card and disconnect the linkages and actuator connectors before extracting the lock assembly from the door.
- Install the new lock assemblies in reverse order. Ensure mechanical linkages move freely and that the key turns smoothly in both ignition and door lock.
- Important: Many modern Peugeot/Citroën keys contain transponders for the immobilizer. If the supplied key includes a transponder, the immobilizer may require programming to the vehicle. Programming is often performed with dealer or specialist diagnostic equipment.
- After installation, check all functions: door lock/unlock, central locking (if applicable), ignition positions and starter engagement, and immobilizer reset/recognition.
Common Causes Of Failure
Mechanical wear from repeated use is the most frequent cause: tumblers and wafers inside the barrel wear down over time, producing a loose or sticking key. Corrosion and contamination (water, dirt) can seize mechanisms in the door lock or ignition barrel. Broken or bent keys, attempted forced entry, and internal spring failures also lead to malfunction. In vehicles with electronic immobilizers, faults in the transponder or immobilizer antenna can mimic mechanical failure though the lock itself appears intact.
Who Should Install
This part is aimed at professional auto technicians and experienced DIY mechanics. If immobilizer programming is required and you do not have suitable diagnostic tools, consider assistance from a locksmith or dealership for key coding.
Supplied as a practical replacement solution for restoring reliable locking and starting functions on affected Peugeot/Citroën vehicles.
