Description
Ignition switch housing, driver’s door lock and two keys for PEUGEOT 407 vehicles. Keys may be damaged, but they work fully with the lock.
Product Overview
This complete set includes the ignition switch housing (ignition barrel/steering lock), the driver's door lock and two keys for Peugeot 407 models. It is a direct-fit component that commonly appears in searches by part numbers 4162EQ and 4162EA, making it easy for mechanics and DIY enthusiasts to find the right replacement. The assembly restores mechanical locking function and steering immobilizer engagement when the original unit is worn or damaged.
Benefits For Mechanics And DIYers
- Direct replacement for door lock and ignition barrel on Peugeot 407 — reduces diagnostic and installation time.
- Part numbers 4162EQ / 4162EA are frequently used in searches, improving findability and compatibility checks.
- Includes two keys — useful for workshop testing and temporary operation; note that keys may show visible damage but operate the lock.
How The Part Functions
The ignition switch housing secures the ignition cylinder and contains mechanical and electrical contacts that detect key position (Lock/Accessory/Run/Start). Together with the door lock it provides secure mechanical locking of the vehicle and interfaces with the vehicle's immobilizer system via the transponder in the key (if present). Proper operation ensures steering column lock engagement and reliable key turn action.
Installation Guide
Recommended for qualified mechanics or experienced DIYers. Typical replacement steps:
- Disconnect the battery before starting to avoid short circuits and to protect vehicle electronics.
- Remove steering column covers to access the ignition housing (Torx and Phillips tools commonly required).
- Unscrew mounting bolts securing the ignition switch housing and carefully unplug any electrical connectors if present.
- Withdraw the ignition barrel assembly. If replacing the driver's door lock as well, remove the door panel to access the lock cylinder and retaining clip/bolts.
- Install the new unit in reverse order. Ensure mechanical alignment of the steering lock and correct reassembly of trim pieces.
Time estimate: 30–90 minutes depending on access and whether the door lock requires door-panel removal. Use threadlocker on fasteners where specified by the vehicle manufacturer.
Programming And Immobilizer Notes
Depending on the vehicle and whether the transponder keys match the vehicle immobilizer, key programming or cloning may be required for engine start. If the supplied keys do not contain the correct transponder data, they may operate the mechanical locks but the engine will remain immobilized until the transponder is programmed to the vehicle's immobilizer system. Key cutting and transponder programming are typical follow-up services.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Peugeot 407
- Product Codes: 4162EQ, 4162EA
- Additional Numbers: Peugeot 407 (see part codes for exact fitment)
Installation Recommendations
- Always disconnect the battery before removal/installation to prevent damage to electrical components.
- Retain original fasteners and check for any plastic clips that may be brittle on older vehicles.
- Inspect the key transponder and, if necessary, arrange key cutting and immobilizer programming after mechanical installation.
- Verify lock operation (door and ignition) before reassembling interior trims.
Most Common Failure Reasons
- Mechanical Wear: Tumblers and cylinder wear over time cause key turning difficulties or jamming.
- Key Damage: Bent, worn or broken key blades reduce reliability and can damage the lock cylinder.
- Corrosion and Dirt: Moisture ingress or debris in the lock mechanism leads to sticking or electrical contact faults.
- Electrical Switch Wear: Contact wear inside the ignition switch (if integrated) can cause intermittent accessory or start problems.
- Forced Entry or Vandalism: Physical damage from attempted theft can deform the cylinder or break internal parts.
Compatibility And Search Tips
Search by part codes 4162EQ and 4162EA and by vehicle model Peugeot 407 to quickly locate matching listings. Confirm physical appearance and connector types where applicable before installation.
Final Notes
This assembly is an effective solution when the mechanical lock or ignition cylinder shows wear or when spare keys are required for workshop use. Ensure proper key programming if the immobilizer system requires transponder authentication for engine start.
