Description
Ignition Barrel, Driver’s Door Lock and One Key
For CITROEN PEUGEOT Vehicles
From PEUGEOT 407
High-quality used ignition barrel combined with the driver’s door lock supplied with one key. This assembly is sourced from a Peugeot 407 and is frequently searched under OEM codes 4162EQ and 4162EA. Designed for mechanics and experienced DIYers, the unit replaces worn or faulty lock cylinders and driver-side door locks that cause jamming, key wear, or inability to unlock or start the vehicle.
Function And Application
The ignition barrel (lock cylinder) controls mechanical key engagement for starting the engine and operates the steering lock mechanism. The driver’s door lock secures the vehicle and provides the mechanical interface for the door handle and central locking actuator. This combined replacement is ideal when the door lock cylinder and ignition barrel show mechanical wear, broken wafers/tumblers, or if the existing key is damaged.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Peugeot 407
- Product Codes: 4162EQ, 4162EA
- Additional Numbers: 4162.EQ, 4162.EA (common variants)
Which Vehicles Fit
Direct fit for Peugeot 407. The part is often catalogued under the listed OEM codes; compatibility with other Stellantis models depends on platform and year. When searching, technicians commonly use the product codes 4162EQ / 4162EA to locate matching parts.
Replacement Procedure (Overview)
Recommended For: Professional mechanics or skilled DIYers with basic tools (Torx, screwdrivers, trim tools) and, if required, key programming equipment.
- Ignition Barrel Removal/Installation: Remove steering column trim, locate the retaining screw or release tab, turn the key to the release position, extract the old cylinder and insert the replacement ensuring correct alignment of the steering lock and key position. Refit trim and test mechanical operation of the barrel and steering lock.
- Driver’s Door Lock Removal/Installation: Remove interior door card, disconnect electrical connectors for the central locking actuator (if present), remove the lock retaining bolts and retaining clips, withdraw the lock cylinder assembly and replace with the new unit. Reassemble door trim and check door operation and central locking.
- Key Handling: The unit is supplied with one mechanical key. If the key contains a transponder, transponder cloning or programming may be required for immobilizer recognition — plan for key cutting and immobilizer programming as needed.
Installation Recommendations
- Disconnect the negative battery terminal before beginning work to avoid short circuits and to protect immobilizer/electrical components.
- Work on a stable surface with organized fasteners; keep small clips and screws in a tray to avoid loss.
- Use plastic trim tools to avoid damaging interior panels when removing the door card or steering column covers.
- After installation, verify mechanical lock operation (door open/close, lock/unlock) and ensure the ignition barrel turns smoothly through all positions. If transponder programming is required, perform programming with appropriate diagnostic equipment.
Common Failure Reasons
- Mechanical Wear: Repeated use causes wafers/tumblers in the cylinder to wear, resulting in key play, difficulty turning, or failure to turn.
- Corrosion And Dirt: Water ingress or dirt accumulation in the door lock or ignition barrel leads to sticking or seizure.
- Broken Key Or Internal Components: Keys worn down or broken inside the cylinder can damage internal components and prevent operation.
- Actuator Or Linkage Faults: In door assemblies, the central locking actuator or internal linkages may fail, giving the impression of a faulty lock cylinder when the actuator is the cause.
- Electrical Issues Related To Locking Systems: Faulty wiring or connectors can prevent central locking from functioning even if the mechanical cylinder is fine.
Why Choose This Part
Buying a complete ignition barrel and driver door lock assembly with a key is a practical solution when multiple lock components show wear or the key is damaged. Using the OEM product codes 4162EQ / 4162EA simplifies parts lookup and ensures you receive an assembly compatible with the Peugeot 407 lock architecture.
Note For Professionals
For workshops: Keep the OEM codes on hand when ordering and verify key cutting and transponder requirements before installation to minimize vehicle downtime.
