This used assembly pairs the immobilizer module, one transponder key fob and the engine ECU into a single matched set taken from the donor vehicle. It is ideal for mechanics and competent DIYers who need a ready-paired unit for Citroën C1 / Peugeot 107 platforms with the 1.0 1KR petrol Euro 4 engine. Because the parts were working together on the donor car (engine started), the set reduces time spent on part matching and troubleshooting; the only reported issue was the remote not locking, most likely due to a depleted key battery.

Key Features & Function

– Immobilizer Unit: Authorizes the correct transponder key before the ECU enables fuel and ignition circuits, preventing unauthorized engine start.
– Engine Control Unit (ECU): Manages fuel injection, ignition timing and engine sensors for the 1.0 1KR Euro 4 engine.
– Key Fob With Transponder Chip: Provides remote locking/unlocking (remote may require battery replacement) and contains the immobilizer transponder that must be recognized by the immobilizer unit.

Technical Information

• Manufacturer: Stellantis (Citroën / Peugeot)
• Model: Citroën C1 / Peugeot 107 (1.0 1KR, Euro 4)
• Product Codes: 89780-0H020, 89780-0H021, 89740-0H010, 89740-0H011, 0261208702, 89661-0H022
• Additional Numbers: 6580V7, 6252P3

Fitment And Compatibility

Designed for Citroën C1 and Peugeot 107 models equipped with the 1.0 1KR petrol engine (Euro 4). Originates from a 2007 Citroën C1. Ensure the listed product and additional numbers match the part you require before installation.

Installation And Coding – Important

– The unit is used and is “paired” with the original vehicle (VIN/PIN/keys).
– Activation options:
1) Cloning data from the old unit (EEPROM/Flash) – after cloning the unit is plug and play.
2) Virginization and subsequent initialization/telecoding via DiagBox (or online) + key adaptation.
– Recommended to be performed by a specialist with PSA service equipment (DiagBox/Lexia/PP2000).
– Before removal/installation always disconnect the battery and follow the manufacturer’s procedure to avoid damaging the unit.

Recommended Installation Notes

• Disconnect the negative battery terminal before starting work to prevent short circuits and protect electronic modules.
• Handle the ECU and immobilizer with anti-static precautions and avoid exposing connectors to moisture or dirt.
• Label connectors and routing during disassembly to ensure correct reconnection; secure connectors fully and avoid bent pins.
• After fitting, follow the coding/initialization route described above to ensure keys and immobilizer are properly synchronized with the ECU.

Typical Failure Causes

The most common reasons these systems fail or show symptoms are:

• Depleted Key Fob Battery: Remote locking/unlocking failure is often simply a flat battery in the key fob.
• Immobilizer Synchronization Loss: Electrical faults, battery disconnection or module replacement can desynchronize keys and immobilizer.
• Water Ingress / Corrosion: Moisture or corroded connectors can cause intermittent faults or permanent damage to modules.
• Electrical Surges / Starter Motor Issues: Voltage spikes or poor grounding can damage ECU electronics.
• Internal Module Fault: Capacitor failure or solder joint problems inside the ECU/immobilizer can lead to non-start conditions.

Why Choose This Set

This matched set saves time for workshops and experienced DIYers by delivering components already working together on the donor vehicle. Ideal when the engine runs but remote locking or key recognition is unreliable — often the fastest path back to a properly operating vehicle when combined with correct coding or cloning procedures.

What Is Included

• Immobilizer Unit
• Engine Control Unit (ECU)
• One Key Fob With Transponder Chip

Notes

Remote control issues are commonly resolved by replacing the key fob battery first. For full functionality (start authorization and remote features) follow the installation and coding instructions above. Use appropriate PSA diagnostic equipment for programming or cloning to ensure reliable operation.

Are you looking for a reliable auto part for your Citroën or Peugeot vehicle? Our offering of a used ECU from leading manufacturer Bosch is an optimal solution for your needs. This crucial component of electronic engine control has been carefully selected to meet your quality and durability requirements. It is designed for vehicles such as PEUGEOT 107 and CITROEN C1 with robotic transmission and EURO 5 standard, ensuring its functionality and efficiency according to your vehicle’s specifications.

Effective engine management is key to optimizing performance and reducing emissions. This engine control unit (ECU) is essential for managing several functions of your car, including fuel injection, chokes, and other critical engine parameters. Therefore, its reliability and accuracy are of utmost importance.

Technical Information:
Manufacturer: Bosch
Model: Citroën C1, Peugeot 107
Product Codes: 0261208702, 89661-0H230
Additional Numbers: B000727680

This engine control unit is ideal for those seeking a quality replacement part without investing in a completely new component while still maintaining the original performance and emission standards of their vehicle. We recommend consulting a professional mechanic for installation and maintenance to ensure proper functionality and safety in operation.

Don’t hesitate to improve your vehicle’s performance with this quality and verified auto part that we offer at the highest standards. With adequate maintenance and proper usage, this part will provide long-term reliable service.