This Bosch ECU MEV17.4.2 (common part reference 0261S06620) is a direct-fit engine management unit used in Stellantis petrol engines 1.4 VTi. Ideal for professional workshops and experienced DIYers who search by part number (0261S06620, 9676379780, 9666319180, 1677637780, 1944C0, 1944C1). The unit controls fuel injection, ignition timing and other engine management tasks to ensure smooth running, optimal fuel consumption and emission control. Suitable for vehicles that mount this specific Bosch MEV17.4.2 calibration; always compare product codes before ordering.

Technical Information

• Manufacturer: Bosch
• Model(s): Citroën C4 II (B7) 1.4 VTi (Engine Code 8FP). Also fitted to compatible Citroën and Peugeot models using the MEV17.4.2 ECU—check product codes for exact match.
• Product Codes: 0261S06620, MEV17.4.2
• Other Numbers: 9676379780, 9666319180, 1677637780, 1944C0, 1944C1

Function

The ECU (Engine Control Unit) continuously monitors sensors (airflow, throttle position, coolant temperature, oxygen sensors, crankshaft/camshaft position) and controls fuel injectors, ignition timing and other actuators to maintain engine performance and emissions. It also communicates with the vehicle network (CAN) and immobiliser systems.

How To Replace

Replacement should be carried out by an experienced technician or a competent DIYer with the correct tools. General steps:

1. Disconnect the negative battery terminal and wait a few minutes to discharge residual power.
2. Locate the ECU (position varies by model—engine bay or under dashboard). Follow the vehicle service manual for access and removal instructions.
3. Unplug wiring harness connectors carefully, release any locking tabs, and remove mounting fasteners.
4. Install the replacement unit, secure fasteners to manufacturer torque values, and reconnect the wiring harness.
5. Perform required coding/initialisation (see Installation And Coding – Important below). After coding, verify engine starts and run diagnostic checks for fault codes.

Installation And Coding – Important

• 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. Virginisation 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 Manufacturer Procedures To Avoid Damaging The Unit.

Recommended To Install

Use anti-static precautions when handling the ECU. Ensure connectors and pins are clean and free of corrosion. If cloning, confirm successful read/write of EEPROM/Flash and verify immobiliser data. After installation, clear fault codes and perform a road test while monitoring live data. If you lack PSA diagnostic tools, ask an authorised service to perform the final coding steps to ensure correct immobiliser and engine functions.

Why This Part Most Often Fails

Common causes of ECU failure include water ingress, corrosion on connectors, thermal stress from repeated high engine bay temperatures, mechanical vibration causing solder joint fatigue, and electrical faults such as short circuits or poor grounding. Failures often present as engine misfires, non-start conditions, erratic idling, intermittent faults or multiple diagnostic trouble codes. In many cases the ECU electronics remain intact and the unit can be restored by software cloning or reprogramming; however, physical damage to the housing or PCB requires replacement.

Notes For Mechanics And DIYers

• Search By Part Number: Buyers frequently find this unit using references 0261S06620, 9676379780, 9666319180 or calibration labels (1944C0/1944C1, 1677637780).
• Diagnostics: Always perform a full fault code readout and record freeze-frame/fuel trims before replacing the ECU to avoid unnecessary part changes.
• Quality: This listing refers to the specific Bosch MEV17.4.2 calibration. Confirm code match prior to fitting.

With part numbers 0261S06472, 9675495080, and 9666319180, this unit provides compatibility with various models within the PSA Citroën Peugeot lineup. The ECU’s advanced technology enables precise control over fuel injection, ignition timing, and emissions management, contributing to enhanced engine responsiveness and reduced environmental impact.

Replacing the ECU is a straightforward task for both professional mechanics and DIY enthusiasts. It typically involves disconnecting the battery, removing the old unit, and installing the new one, followed by reconnecting all electrical connections and performing a system reset.

Electronic control units like the MEV17.4.2 can wear out due to factors such as overheating, electrical surges, or physical damage. Regular diagnostics and maintenance can help identify and address potential issues before they lead to ECU failure, ensuring your vehicle runs smoothly and efficiently.

Technical Information

• Manufacturer: Bosch
• Model: MEV17.4.2
• Product Codes: 0261S06472, 9675495080, 9666319180
• Additional Numbers: N/A