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).

Overview

This kit contains the vehicle immobilizer/central locking module together with two working transponder key fobs suitable for Citroën C1 and Peugeot 107. The components are already matched to each other from a single donor vehicle, which simplifies integration with the vehicle body and locking system. To complete the installation, the engine control unit (ECU) from the recipient vehicle needs to be programmed or its data transferred by diagnostic equipment.

Function And Typical Symptoms

The immobilizer unit prevents the engine from starting unless a recognised transponder key is present. The central locking module controls door locking/unlocking and communicates with the key fobs. Common symptoms indicating a faulty unit or mismatch include: engine does not crank or starts then cuts out, immobilizer warning light on the dash, remote locking/unlocking does not respond, or intermittent lock operation.

Replacement Procedure

Basic replacement steps for experienced technicians or competent DIYers:

• Disconnect the vehicle battery before any work to avoid short circuit or damage to electronics.
• Locate the immobilizer/central locking unit (position varies by model; typically behind the dashboard or within the steering column / central console area).
• Remove surrounding trim and fasteners to access the module, unplug electrical connectors and remove the unit.
• Install the replacement unit, connect harnesses and secure fasteners. Refit trims.
• Perform required diagnostic procedures to load or clone ECU/key data so the engine control unit recognises the new immobilizer/locking set.

How Often It Fails And Why

Failure intervals vary widely. Common causes of malfunction include corrosion or water ingress, connector or wiring faults, physical impact from accidents, internal electronic faults such as failed components or cracked solder joints, and key fob battery depletion. Environmental exposure and electrical surges are frequent contributors to premature failure.

Technical Information

• Manufacturer: Stellantis / Citroën / Peugeot
• Model: Citroën C1, Peugeot 107
• Product Codes: 6545PN, 6545PR, 1608508080, 89780-0H021, 89740-0H011
• Additional Numbers: 89740-011 (variant), 6545PR, 6545PN

Installation Recommendations

Carry out installation in a dry, static-free environment. Always disconnect the battery before removing or installing control units and follow the vehicle manufacturer’s service procedures. For key fobs, check and replace the internal battery if remote range is poor. After mechanical installation, a diagnostic session is required to integrate the engine ECU and immobilizer data or to perform cloning/initialization.

Why This Part Most Often Fails

Electronics in locking and immobilizer units are sensitive to moisture and mechanical stress. Repeated exposure to humidity, water leaks, or vibrations can cause connector corrosion and internal component failure. Additionally, improper jump-starting or electrical faults can damage the unit. Wear and tear of key fobs (buttons, battery) also leads to perceived failures of the locking system.

Installation And Coding – Important

– The unit is matched to the donor vehicle and is paired with the original car (VIN/PIN/Keys).
– Options to bring the unit into operation:
1) Cloning data from the old unit (EEPROM/Flash) – after cloning the unit is plug and play.
2) Virginisation and subsequent initialization/telecoding via DiagBox (or online) + key adaptation.
– Recommended to be performed by a professional with PSA service equipment (DiagBox/Lexia/PP2000).
– Always disconnect the battery before disassembly/assembly and follow the manufacturer procedure to avoid damaging the unit.