Description
Electric power steering column by Jtekt or Denso or Koyo. For Citroën C1, Peugeot 107 and Toyota Aygo. Tested, fully functional.
This electric power steering column is a direct-fit replacement commonly referenced under part numbers 45250-0H011-00, 4123AV and 995-10500. Designed for use on Citroën C1 and Peugeot 107 (also fitted to Toyota Aygo), it provides the original equipment style electric assist and plug-and-play mechanical fitment for technicians and DIY enthusiasts familiar with small city car steering systems. Ideal for workshops and home mechanics searching by OE code, this unit restores normal steering assist, reduces steering effort at low speeds and eliminates steering vibration or play associated with a failing column assembly.
Technical Information
- Manufacturer: Jtekt / Denso / Koyo
- Model: Citroën C1, Peugeot 107, Toyota Aygo
- Product Codes: 45250-0H011-00, 4123AV, 995-10500
- Other Numbers: Stellantis Cross-Reference Numbers / Supplier References
Key Function
The assembly contains the electric assist motor, torque sensor and column mechanics that together provide power-assisted steering (EPS). It multiplies driver torque input to reduce effort at low speeds while maintaining good steering feel at higher speeds. Properly functioning columns also house electrical connections for horn, airbag and steering angle signal (depending on vehicle trim).
How Replacement Is Performed
- Disconnect the battery and wait the manufacturer-recommended time to disable the airbag system.
- Remove steering wheel and trim panels to access the column covers and electrical connectors.
- Note alignment of the steering wheel and mark the center position before removal.
- Disconnect electrical connectors (airbag, horn, ignition switch, EPS connectors) and unbolt the column from dash mounts and steering shaft coupling.
- Install new column, ensure correct meshing at the intermediate shaft, torque mounting fasteners to manufacturer specification and reconnect all plugs.
- Restore battery power, clear fault codes and perform steering angle sensor calibration if required by the vehicle.
Installation Recommendations
- Always disconnect the battery and follow the vehicle maker’s airbag safety procedure before starting.
- Keep connectors and wiring clean and free of corrosion; apply contact grease where appropriate on metal terminals.
- Respect steering alignment marks and check that the column is fitted with the wheels pointed straight ahead to avoid steering angle offsets.
- Use correct tools for steering wheel removal to avoid damaging splines and clockspring; replace clockspring if damaged or if airbag faults appear.
- After installation, check for diagnostic trouble codes and perform any required calibration or adaptation procedures with suitable diagnostic equipment.
Most Common Failure Causes
- Torque sensor or internal electronics degradation causing intermittent or total loss of assist.
- Moisture ingress and connector corrosion, especially in vehicles exposed to salty or wet environments.
- Mechanical wear in bearings or universal joints leading to excess play or vibration.
- Impact damage from collisions that deform column components or affect electrical connections.
- Wiring harness faults or connector damage due to previous repairs or incorrect routing.
Signs It Needs Replacement
- Increased steering effort or sudden loss of power assist.
- EPS or warning lights on the instrument cluster; persistent fault codes related to steering torque sensor.
- Clunking, grinding or noticeable play in the steering column.
- Intermittent assist that returns after a restart or driving for a while.
This listing is intended for professional mechanics and capable DIYers who search by OE numbers such as 45250-0H011-00, 4123AV or 995-10500. Replacing the steering column restores safe, reliable steering performance—follow the installation recommendations and verify proper function after fitting.
