High-quality power steering control unit designed for Citroën C2, Citroën C3 and C3 Pluriel vehicles. Ideal for professional workshops and experienced DIY mechanics searching by reference numbers 9659514180, 400693 or 400692. This unit restores precise electric power assistance, reduces steering effort at low speeds and ensures predictable steering response during manoeuvres. Compatible replacement for original Stellantis Citroën/Peugeot assemblies, it is a direct-fit part for models listed and commonly sought under the product codes shown.

Technical Information

• Manufacturer: Stellantis (Citroën/Peugeot)
• Model: Citroën C2, Citroën C3, Citroën C3 Pluriel
• Product Codes: 9659514180, 400693, 400692
• Other Numbers: NFP

Function And Benefits

The unit controls the electric power steering motor and associated sensors to deliver variable assistance depending on vehicle speed and steering input. Benefits include reduced steering effort at low speeds, improved fuel efficiency compared with hydraulic systems, and consistent steering feel. For workshops, replacing a faulty unit returns drivability and safety to the vehicle while eliminating steering-related fault codes.

Typical Failure Modes

Most common causes of failure are electrical faults (corroded connectors, moisture ingress), wear or damage to the motor/sensor components, and intermittent faults caused by broken solder joints or aged electronics. Symptoms include loss of power assist, sudden heavy steering, warning lights or stored error codes related to steering assistance. Failures are usually age- or environment-related rather than mileage-specific.

How It Is Replaced

Replacement should be performed by a competent technician or a skilled DIYer with good technical knowledge. Typical steps:

• Disconnect the negative battery terminal before starting to avoid electrical damage.
• Remove lower dashboard and steering column covers to access the unit and connectors.
• Unplug electrical connectors and remove mounting fasteners securing the unit.
• Fit the replacement unit, secure bolts to manufacturer torque settings and reconnect connectors.
• Reconnect the battery and clear any related fault codes with a diagnostic tool.
• Perform steering angle sensor calibration and, if required, system initialization using a diagnostic interface to ensure correct assistance behaviour.

Installation Recommendations

• Always Disconnect The Battery Before Working On The Unit.
• Inspect Connectors And Wiring For Corrosion Or Damage; Repair As Needed Before Installing The New Unit.
• Use Correct Torque Values For Mounting Bolts And Avoid Over‑tightening.
• After Installation, Clear Fault Codes And Calibrate Steering Sensors With Appropriate Diagnostic Equipment.
• Road-Test The Vehicle To Verify Proper Steering Assistance And That No Warning Lights Reappear.

Why This Part Is Often Replaced

The electric power steering unit is exposed to vibration, temperature cycles and, in some installations, moisture. Over time these factors can lead to connector corrosion, motor wear or electronic component failure. Impact damage from accidents or improper handling during previous repairs also causes frequent replacements.