Description
Ignition switch, driver’s door lock and one key for Citroën and Peugeot vehicles. It is from Peugeot 407.
This assembly combines the ignition switch (steering column barrel), the driver’s door lock cylinder and a single key — a practical replacement for workshop technicians and DIY enthusiasts working on Citroën and Peugeot models. Supplied as a direct-fit unit from a Peugeot 407 donor, the part offers correct mechanical geometry and original locking components that simplify installation and restore vehicle access and starting function. Common search terms include ignition switch, door lock cylinder, key, 4162EA and 4162SP, which helps customers and garages find the correct spare quickly.
Fitment And Compatibility
Designed for Peugeot 407 applications and commonly associated fitment with related Citroën/Peugeot platforms (examples: Citroën C4 in the same parts families). Always verify the part number stamped on the unit against the vehicle’s existing part to ensure mechanical match. Key and immobiliser electronics can differ between variants—see installation notes below.
Technical Information
- Manufacturer: Citroën / Peugeot (Stellantis)
- Model: Peugeot 407; compatible with related Citroën/Peugeot models (e.g. Citroën C4)
- Product Codes: 4162EA, 4162SP, NFP
- Other Numbers: Tags/labels show 4162EA | 4162SP
Installation Recommendations
- Work With The Battery Disconnected: Remove the negative battery terminal before starting to avoid short circuits and immobiliser faults.
- Remove Interior Trim And Steering Column Covers: Access the ignition switch by removing the steering column shrouds and any obstructing trim on the driver’s door to reach the lock cylinder.
- Door Lock Cylinder Replacement: Remove the door card to access the lock mechanism. Unclip securing rods carefully and note their routing for reassembly.
- Ignition Switch Removal: Unplug electrical connectors and unscrew the ignition switch housing. Keep track of screws and small clips to ensure correct refit.
- Key And Immobiliser: If the supplied key contains a transponder, it may need to be coded to the vehicle immobiliser using a diagnostic tool or programming procedure. Some vehicles allow key coding only with OEM or aftermarket diagnostic equipment.
- Lubrication And Adjustment: Before final assembly, lubricate mechanical tumblers with graphite or a lock-specific lubricant. Avoid petroleum-based sprays that attract dirt.
- Test Before Reassembly: Verify door lock operation, key turn smoothness and ignition electrical circuits before refitting trims.
Why This Part Fails Most Often
Failures are typically mechanical or electrical in origin. Mechanical wear to tumblers and lock pins caused by prolonged use, dirt ingress or corrosion leads to sticking keys and broken tumblers. On the ignition switch side, electrical contacts and microswitches can wear or develop intermittent faults, causing problems with accessory positions, starter engagement or complete no-start conditions. Keys themselves can deform or snap, transferring damage to the cylinder. Water ingress, vandalism and impact damage are other common causes.
Practical Tips For Garages And DIYers
- When replacing both door and ignition locks together, consider rekeying or programming so a single key operates all locks.
- Keep a record of original part numbers and photographed wiring/rod positions to simplify reassembly.
- Use correct diagnostic equipment to confirm immobiliser recognition after fitting a new/transferred transponder key.
- Inspect adjacent components (steering column switches, door latch mechanism, central locking actuators) for wear while performing the job to avoid repeat visits.
Supplied part numbers (4162EA / 4162SP) are frequently used as search keywords by workshops and private buyers — include them in your order search to find matching units quickly.
