Description
Ignition Barrel, Driver’s Door Lock And One Key For Peugeot 407
This complete ignition barrel and driver’s door lock set with one key is a direct-fit replacement for Peugeot 407 applications. Designed for professional garages and experienced DIY mechanics, the assembly restores reliable locking and ignition function when the original barrel or door lock shows wear, binding or electrical faults. Frequently searched under part numbers 4162EQ and 4162EA, this unit brings back safe access and dependable engine start behaviour.
How It Works
The ignition barrel provides the mechanical interface for the ignition switch, allowing the key to rotate between off, accessory and start positions. The driver’s door lock secures entry and, together with the supplied key (including vehicle transponder if fitted), ensures the immobiliser system recognises the key. Failure of the barrel or lock can prevent door operation, make key insertion difficult or stop the engine from starting if the immobiliser circuit is interrupted.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Peugeot 407
- Product Codes: 4162EQ, 4162EA
- Additional Numbers: Not Available
Recommended Installation
- Always disconnect the battery before beginning work to avoid short circuits and protect vehicle electronics.
- Remove interior trim and steering column covers as required to access the ignition barrel; for the door lock, remove the door card to access the lock mechanism and rods.
- Disconnect any electrical connectors (immobiliser antenna or door lock switches) before removing the old unit. Keep track of clips and screws for correct reassembly.
- Fit the new barrel and lock mechanically first, then reconnect electrical connectors and test mechanical movement of the key and door locking operation before reassembling trims.
- If the supplied key contains a transponder, it must be correctly recognised by the vehicle immobiliser. Reprogramming or synchronising may be necessary and should be performed by a qualified locksmith or authorised service centre if required.
- After installation, verify central locking, door locking/unlocking and ignition positions (accessory, run, start) for smooth operation.
Most Common Failure Reasons
- Mechanical Wear: Over time tumblers, springs and the cylinder surface wear, producing sticking, key jamming or inability to turn.
- Corrosion and Dirt: Moisture ingress or road dirt can corrode internal parts, leading to rough operation or seizure.
- Broken Keys or Bent Blades: Physical damage to the key can damage the barrel or prevent correct engagement.
- Immobiliser/Transponder Issues: Faulty antenna rings or damaged transponder chips prevent the engine ECU from receiving the correct code, causing non-start conditions.
- Vandalism or Forced Entry: Physical damage from forced attempts to open the door or start the vehicle can destroy lock components.
Practical Tips
- Use a graphite-based lock lubricant rather than oil to keep the barrel moving freely without attracting dirt.
- If keys are worn, replace or have new keys cut to match the new barrel to avoid premature wear to the replacement part.
- Inspect associated linkages, rods and electrical connectors when replacing the lock to ensure there are no secondary faults.
Compatibility And Search Tips
This part is commonly searched by product codes 4162EQ and 4162EA and is intended for Peugeot 407 models. When searching in parts catalogs or referencing repair manuals, use the product codes and model designation “Peugeot 407” to locate matching fitment information.
