This combined set is ideal for professional workshops and DIY mechanics who need a ready-matched immobilizer solution for Citroën C1 and Peugeot 107 with the 1.0 1KR Euro 4 engine. The package contains the vehicle’s immobilizer unit, engine control unit (ECU), ignition barrel and two transponder keys taken from the same donor car — reducing the amount of coding work compared with mismatched components. Customers often search by part numbers listed below, so the set is suitable when replacing a failed immobilizer system or replacing an ECU after electrical damage.

Technical Information

• Manufacturer: Stellantis / Citroën / Peugeot
• Model: Citroën C1, Peugeot 107 (1.0 1KR, Euro 4) — Origin: Citroën C1 (2009)
• Product Codes: 89661-0H070, 0261S04464, 4162FK
• Other Numbers: 89780-0H020, 89780-0H021, 89740-0H010, 89740-0H011, 6580V7, 6252P3, 1943FE

What The Set Does

The immobilizer unit communicates with the transponder chips inside the keys to allow engine start. The Engine Control Unit (ECU) manages fuel injection, ignition timing and emission control; it will only allow the engine to crank and start when it receives the correct immobilizer authorization. The ignition barrel provides the mechanical switch function and houses the antenna/reader for the transponder key.

Replacement Procedure

Typical replacement steps for experienced technicians:

• Disconnect the battery before any work.
• Remove steering column covers to access ignition barrel and immobilizer module.
• Unplug electrical connectors and remove the ignition barrel and immobilizer module.
• Access and remove the ECU (usually located in the engine bay/passenger compartment depending on model).
• Install the donor units in reverse order; ensure connectors are clean and secure.
• Perform cloning or coding procedure (see Installation and Coding section below) to authorize keys and ECU with the immobilizer.

Common Failure Causes

• Corrosion or water ingress causing connector faults or internal damage to immobilizer or ECU.
• Electrical surges from jump-starts or charging faults damaging ECU electronics.
• Wear to the ignition barrel or key transponder failure due to mechanical damage.
• Intermittent faults caused by poor grounding or loose connectors.

Installation Recommendations

• Always Disconnect The Battery Before Removal/Installation To Prevent Damage And Avoid Airbag/ECU Faults.
• Inspect Connectors And Wiring For Corrosion, Clean Contacts, And Replace Damaged Clips Or Harnesses.
• Use Proper Diagnostic/Programming Equipment (DiagBox/Lexia/PP2000 Or Equivalent) For Coding And Key Learning.
• If Possible, Transfer Mounting Hardware And Connector Brackets From The Original Vehicle To Ensure Correct Fitment.
• After Installation, Clear Fault Codes And Perform A Full System Check: Immobilizer, Central Locking, Engine Start And Readiness Tests.

Installation And Coding – Important

• The unit Is Used And Is “Paired” With The Original Vehicle (VIN/PIN/Keys).
• Options For Commissioning:
  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 (Possibly Online) + Key Adaptation.
• Recommended To Be Performed By A Technician 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.

Why Choose This Set

Buying the matched set from a single donor vehicle reduces compatibility issues between immobilizer, keys and ECU and can save significant time during commissioning. It is a practical option for garages and experienced DIYers who can perform cloning or professional coding. The set includes two keys with chips, which is useful when replacing a lost or damaged key pair.

Included In The Package

• Immobilizer Unit (matched)
• Engine Control Unit (89661-0H070 / 0261S04464)
• Ignition Barrel (4162FK)
• Two Transponder Keys

Suitable For Professionals And Competent DIY Mechanics Familiar With Immobilizer Coding And ECU Handling. Always Follow Safe Working Practices And Use Correct Diagnostic Tools For Final Commissioning.

This kit is intended for the repair and replacement of electronics in PSA cars – it includes an engine control unit (ECU), an immobilizer unit, a part of the central locking system and 2x remote key with chip (the keys have the TOYOTA logo). The parts come from the same car and are paired with each other, so they are normally assembled as a complete unit without the need for further pairing by diagnostics.

Suitable for:
Citroën C1, Peugeot 107 and Toyota Aygo with 1KR EURO5 engine.

The main advantage of the complete set:
When replacing the ECU itself or the immobilizer itself, the vehicle often cannot be started for security reasons. This kit solves the replacement as a whole (ECU + immo + keys), which is the fastest way to restart and functional locking.

Technical information:
Manufacturer: PSA / Bosch (according to the ECU designation)
Model: Citroën C1, Peugeot 107 (shared platform with Toyota Aygo)
Product codes:
– 0261S06145
– 6545PN
– 6545PR
Other numbers:
– 89661-0H130
– 89780-0H021
– 89740-0H011
– 1608508080

Installation recommendations:
– Always install as a complete set (ECU + immo + keys) to avoid starting problem for security.
– Before disassembly, disconnect the battery (electronics protection against short circuit and overvoltage).
– Check the condition of the connectors and wiring (oxidation, pulled pins, moisture) and, if necessary, treat the contacts with a suitable product.
– After assembly, verify the function: engine start, immobilizer lights, remote control and central locking function.

The reason why the part most often goes wrong:
Electronics most often suffer from moisture and corrosion in connectors, voltage fluctuations (weak battery, poor charging, starting with low voltage), or a fault in the wiring or after intervention (improper disconnection/connection, short circuit). In addition, with the immobilizer and keys, a malfunction of the chip in the key or damage to the antenna/reading part in the vicinity of the ignition box may occur, which leads to the fact that the unit does not allow start.

Usage in categories:
Electrical components, Control units, Immobilizer unit, Central locking, Door locks and keys (Citroën C1 / Peugeot 107).

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.

Designed specifically for professional mechanics and DIY enthusiasts, this set replaces faulty or worn original parts without the need to invest in brand-new components. Immobilizer systems like this prevent unauthorized engine start, ensuring vehicle security while central locking controls the locking and unlocking of doors electronically.

Over time, immobilizer units and central locking components may malfunction due to wear or electrical faults, leading to starting problems or security risks. Replacing them restores original functionality and improves vehicle safety. The keys included contain immobilizer chips that communicate with the unit to authorize engine start, making key programming essential after installation.

Technical Information

Manufacturer: PSA Citroën Peugeot
Model: Citroën C1, Peugeot 107
Product Codes: 6545PN, 6545PR, 1608508080, 89780-0H021, 89740-0H011
Additional Numbers: No additional specific numbers available

Using original parts designed for older model vehicles ensures compatibility and long-lasting performance in your car’s original system. This solution also helps maintain original aesthetics and supports environmental sustainability by promoting recycling and reducing automotive waste.

Each set consists of 2 chips, ensuring that both the ECU and immobilizer communicate seamlessly. Installation is straightforward—simply mount the components and start your vehicle. This set is particularly beneficial for mechanics and DIY enthusiasts who understand the importance of maintaining optimal functionality in their vehicles.

Technical Information

• Manufacturer: Bosch
• Model: 1.0i 1KR
• Product Codes: 89661-0H070, 0261S04464, 89780-0H021
• Additional Numbers: 1943FE

It is important to note that engine control units can fail over time due to various factors, such as electrical faults, water damage, or component wear. Regular maintenance helps prevent premature failures, ensuring longevity and reliability.

This immobilizer kit includes the immobilizer control unit and two key fobs with chips matched together from a single vehicle. It can be programmed to any first-generation Citroën C1 or Peugeot 107, providing a seamless integration with your car’s engine control system.

Citroën C1 and Peugeot 107 are compact city cars produced between 2005 and 2022.

The first generation of Citroën C1 and Peugeot 107 was manufactured from 06/2005 to 02/2009, with the first facelift running from 02/2009 to 2012, and the second facelift from 2012 to 2014.

The second generation was produced from 2014 to 2022.

When placing an order, you can provide your vehicle’s VIN number so we can verify the compatibility of the immobilizer kit with your specific car.

Technical Information

• Manufacturer: PSA (Peugeot Société Anonyme)
• Model: Citroën C1, Peugeot 107
• Product Codes: 89780-0H021, 6545PR
• Additional Codes: 89780-0H021 6545PR

Function and Replacement

The immobilizer unit plays a crucial role in vehicle security by preventing unauthorized engine starting through electronic authentication. The included chips in the key fobs communicate with the immobilizer control unit to verify the correct key is being used.

Over time, immobilizer units may fail due to electronic component wear or damage, which can cause engine start issues. Replacement is straightforward: the immobilizer unit must be paired with the vehicle’s Engine Control Unit (ECU) and programmed to accept the new keys, a process often done by professional auto locksmiths or experienced mechanics.

This kit is especially valuable for mechanics and DIY enthusiasts looking to restore security functionality on first-generation Citroën C1 or Peugeot 107 vehicles.