Features

• Electric central locking unit with integrated latch and actuator for the left front (driver) door.
• Direct-fit replacement for Citroën Xsara models, simplifies repair and reduces installation time.
• Compatible with standard central locking systems used on PSA vehicles; part number 9135H4 for easy lookup.
• Robust mechanical latch design with electrical actuator to control lock/unlock commands from the central locking system.

Installation

Replacing the left front door lock typically requires basic workshop tools and 30–60 minutes of work for an experienced mechanic. Typical steps:

1. Disconnect the negative battery terminal to prevent short circuits.
2. Remove the interior door trim panel and any moisture barriers carefully to access the lock unit.
3. Disconnect the electrical connector and unclip or detach the linkage rods from the latch.
4. Remove mounting bolts/screws securing the lock assembly, replace with the new unit, and refit all linkages and connectors.
5. Reconnect the battery and test locking/unlocking (both remote and manual) before refitting the door trim.

Common Causes Of Failure

• Wear of mechanical latch components and plastic gear damage inside the actuator over many years of use.
• Water ingress or corrosion affecting electrical contacts and motor functionality.
• Electrical faults such as corroded connectors, broken wiring or intermittent signals from the central locking module.
• Physical damage from forced entry or repeated impact to the door area.

Benefits

• Restores door security and prevents central locking faults that can affect vehicle convenience and safety.
• Direct-fit part number 9135H4 makes ordering and identification straightforward for workshops and DIY repairs.
• Replacing the entire unit addresses both mechanical latch issues and actuator failures in one operation.

Technical Information

• Manufacturer: PSA Citroën Peugeot
• Model: Citroën Xsara
• Product Codes: 9135H4
• Other Numbers: NFP

Original electric central locking door lock for the left front door (driver side) of the Citroën Xsara. This is a genuine PSA part with code 9135H4 (9135.H4), designed to control locking and unlocking, work with remote key fobs and provide correct door status signals to the vehicle control unit. The unit is commonly searched for by its part number 9135H4.

Function And Common Faults

The door lock assembly houses the latch, microswitches and actuator motor that operate the central locking function and inform the car ECU about door status. Typical failure symptoms include the left front door not locking or unlocking with the rest of the vehicle, the lock “popping” back after a lock attempt, incorrect interior lighting behaviour, or a stiff/irregular door handle. Failures are most often caused by worn microswitches, a fatigued actuator motor, or mechanical wear of the latch. Replacing the complete lock is a fast and reliable repair in these cases.

Installation & Practical Tips

• Disconnect the battery before beginning work to avoid short circuits and accidental locking events.
• Remove the door trim panel and release the inner and outer handle linkage rods to access the lock assembly.
• Unplug the electrical connector from the lock and remove the mounting screws located on the door edge.
• Withdraw the old lock, install the replacement, reconnect the connector and linkage rods, then check the operation of the handles and central locking mechanism.
• Before reassembling the door trim, test locking and unlocking with the remote and key. It is recommended to visually compare the shape of the lock body and the connector with your original unit to ensure exact fitment.

Compatibility & Orientation

This lock is intended for the left front door (driver side) on left-hand drive vehicles. It is suitable for Citroën Xsara (N1) models produced approximately between 1997 and 2005. Always confirm compatibility by checking the part code 9135H4 stamped on the original part or by verifying against the vehicle VIN.

Technical information

• Manufacturer: PSA (Citroën/Peugeot)
• Model: Citroën Xsara (N1), approx. 1997–2005, Left Front Door
• Product Codes: 9135H4, 9135.H4
• Other Numbers: NFP (No Longer Produced by Manufacturer)

This original used part is an appropriate direct-fit replacement for a faulty door lock with code 9135H4. If you need an exact-matching central locking lock for a Citroën Xsara, the 9135H4 unit offers a reliable and quick repair option for both professional mechanics and competent DIYers.