Description
Power steering unit KOYO or JTEKT for Citroën C1 or Peugeot 107 or Toyota Aygo
Product Overview
This electric power steering (EPS) unit is suitable for Citroën C1, Peugeot 107 and Toyota Aygo models and is commonly referenced by OEM and spare-part codes such as 89650-0H010, 400659, 1613433780 and 6900000521. The unit integrates the electric motor, torque sensor and control electronics to provide steering assistance while reducing fuel consumption compared with hydraulic systems. Ideal for professional workshops and experienced DIY mechanics who search by part number.
Technical Information
- Manufacturer: KOYO or JTEKT (OE Supplier for Stellantis)
- Model: Citroën C1, Peugeot 107, Toyota Aygo
- Product Codes: 89650-0H010, 89650-010
- Other Numbers: 400659, 1613433780, 161343780, 225000-0080, 6900000521, K91-00500, EPS LH 6900000521
Function
The EPS unit measures driver steering torque and vehicle speed, then supplies the appropriate electric assist via an integrated motor. It replaces hydraulic pumps and hoses, improving efficiency and packaging. The control module also monitors sensors and connectors for faults and may store diagnostic trouble codes that help identify issues.
Replacement Guide
General replacement steps for the EPS unit (procedure may vary by model):
- Disconnect the vehicle battery before any work to prevent electrical damage and to deactivate safety systems.
- Center and lock the steering wheel; mark the steering wheel position relative to the column to preserve alignment.
- Remove required trim panels and lower dash covers to access the steering column and EPS unit.
- Loosen and remove electrical connectors and securing bolts. Support the column if it must be separated from the rack.
- Fit the replacement unit, torque fasteners to manufacturer specification and reconnect electrical plugs ensuring clean, tight contacts.
- Reassemble trims, reconnect the battery and perform electrical checks.
- Perform a steering angle sensor adaptation/calibration and clear fault codes with an appropriate diagnostic tool. Verify correct assist and absence of warnings on the instrument cluster.
Installation Recommendations
- Always disconnect the battery and follow the vehicle manufacturer’s safety procedures before starting work.
- Mark steering wheel alignment before removal and avoid rotating the steering wheel with the unit disconnected.
- Inspect connectors and the wiring harness for corrosion or damage and replace any degraded components to prevent repeat faults.
- Use a suitable diagnostic tool to perform steering angle sensor adaptation and to clear stored fault codes after installation.
- For professional results, fitment by a workshop with experience on PSA/Toyota steering systems is recommended.
Why The Part Fails Most Commonly
Common causes of EPS unit failure include:
- Electrical faults such as connector corrosion, damaged wiring or intermittent connections.
- Motor or internal electronic component failure due to age, heat or moisture ingress.
- Mechanical damage from impacts to the steering column or rack.
- Contamination from water or road salt leading to corrosion of internal parts.
- Stored fault codes or sensor drift requiring recalibration after repairs.
Notes for Mechanics and DIYers
Searches for this unit are frequently performed using part numbers (e.g. 89650-0H010, 1613433780, 400659). If replacing the EPS unit, verify physical fitment and connector type against the vehicle before installation. After replacement, perform a full diagnostic scan and steering angle adaptation to ensure proper operation and safety.
