The original Bosch engine for three-cylinder 1.0i (1KR/1KR-FE) in Citroën C1 and Peugeot 107. Thanks to the same OEM codes, this is an ideal replacement for the fault of the original ECU – just verify the numbers on the label and the compatibility of the car equipment.

The control unit (ECU/PCM) controls fuel injection, ignition, idle and communication with other control systems in the vehicle (BSI, ABS, transmission). Properly functioning ECU is crucial for reliable starts, smooth engine running, meeting emission limits and flawless communication of OBD diagnostics.

Designed for Citroën C1 and Peugeot 107 equipped with 1.0i 1 Kr (1KR-Fe) engine. This variant is used for vehicles with a robotized/automated transmission; When replacing it is important that the numbers correspond to the part, otherwise there is a risk of incompatibility with BSI and transmission functions.

Installation and commissioning: ECU replacement usually requires pairing with an immobilizer/BSI (cloning data or adaptation by diagnostics). After mounting, we recommend adapting the throttle and basic settings, for the robotized gearbox also calibration of the actuators. Always disconnect the battery before dismantling, compare the connectors and make sure of the 89661-0H140 and 0 261 S06 142 codes.

When ECU changes: typical symptoms of the failure include the impossibility to start (Immo/ECU Lock), power failures with control unit in diagnostics, random engine switching, constantly shining engine light, poor/rich mixture without mechanical cause or internal errors of the control unit (eg P0606). Prior to replacement, exclude wiring faults, power and skeleton.

technical information

• manufacturer: bosch
• Model: ECU for 1.0i 1Kr (1KR-Fe), Euro 5, version for automated transmission; Citroën C1 / Peugeot 107
• product codes: 89661-0H140; 0261S06142 (also mentioned as 0 261 S06 142)
• additional numbers: B000577080; NFP

This is the original part of the removal. Before ordering, please check the codes and the execution to ensure full compatibility with your car.

Description

This Magneti Marelli IAW 48P2.7H engine control unit (ECU) is a direct-fit electronic control module originally removed from a Citroën C2 1.1i. It is an ECU commonly referenced by part numbers and codes such as 9655756780, 9645989480 and 1938VY / 1938.VY. The unit manages fuel injection, ignition timing and related engine sensors to ensure correct engine running, drivability and emissions compliance on compatible Citroën models. Ideal for professional workshops and experienced DIY mechanics searching by part number, this ECU is offered as a replacement for vehicles with matching hardware and software requirements.

Technical Information

• Manufacturer: Magneti Marelli
• Models: Citroën C2 (1.1i), Citroën C3 (applications with the same ECU code)
• Product Codes: 9655756780, 9645989480, 1938VY
• Other Numbers: IAW 48P2.7H, 1938.VY, (Reference Fault Code Often Associated: P0606)

Compatibility And Identification

Mechanics commonly search for this unit by its code (IAW 48P2.7H) or OEM numbers listed above. Before installation, compare the ECU’s label codes and connector layout with the original module to confirm mechanical match. This unit is typically used on small-displacement Citroën petrol engines (1.1i) of the same generation; cross-referencing part numbers is the fastest way to identify compatibility.

Replacement Procedure (Overview)

Replacing the ECU is straightforward for a trained technician but involves security and coding steps. Typical replacement workflow:

1. Disconnect the negative battery terminal and wait a few minutes to ensure systems power down.
2. Locate and remove trim/paneling to access the ECU (usually in the engine bay or dash area depending on model).
3. Carefully unplug electrical connectors—do not force or bend pins—and remove retaining screws or brackets.
4. Install the replacement unit, securing connectors and brackets; reconnect battery only after physical installation is complete.
5. Perform cloning or initialization/coding to match the vehicle immobilizer and settings (see Installation And Coding – Important).

Installation And Coding – Important

• The unit is used and is paired with the original vehicle (VIN/PIN/keys).
• Options To Commission:
  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).
• Always disconnect the battery before removal/installation and follow the manufacturer’s procedure to avoid damaging the unit.

Installation Recommendations

• Handle the ECU by its housing; avoid touching circuit boards or connector pins.
• Use the correct torque for mounting screws and ensure connectors fully click into place.
• After installation, clear stored fault codes and verify sensor inputs and actuator outputs with a diagnostic tool.
• Perform immobilizer/key adaptation or cloning as required so the engine will start and run reliably.

Why This Part Commonly Fails

Typical causes of ECU failure include moisture ingress and corrosion at connector pins, electrical surges from battery events or improper jump-starts, thermal stress and failed solder joints or components inside the module. Software corruption or EEPROM/processor faults can trigger diagnostic trouble codes such as P0606 (processor fault). In many cases symptoms are intermittent stalling, no-start, multiple engine management warning lights, or erratic sensor readings. Addressing root causes (corroded harness, poor grounding, battery issues) is crucial to prevent repeat failures.

Who Should Fit This Unit

Recommended for professional auto electricians and experienced DIY mechanics comfortable with ECU removal, electrical diagnosis and vehicle coding. Proper diagnostic equipment and knowledge of PSA vehicle procedures will ensure correct commissioning and reliable operation.