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.

Product Overview

This Bosch ECU (MEV17.4.2) is designed for a range of Citroën and Peugeot petrol engines. It manages fuel injection, ignition timing, emission controls and engine diagnostics, providing reliable engine management for models frequently fitted with units referenced by part numbers 0261S06472, 9675495080 and related codes. Ideal for professional workshops and experienced DIY mechanics who search by product code (0261S06472, 9675495080, 9666319180, 1607128580, 1677613380) to find a direct replacement.

Technical Information

• Manufacturer: Bosch
• Model: Citroën C4 II; Peugeot 207; Peugeot 3008 I; Peugeot 308
• Product Codes: 0261S06472; 9675495080; 9666319180
• Other Numbers: 1607128580; 1677613380
• Control Unit Family: MEV17.4.2

Function And Compatibility

The Bosch MEV17.4.2 ECU Controls Key Engine Functions: Fuel Injection, Ignition Timing, Idle Regulation, Lambda/Emission Management And Diagnostic Fault Logging Via The Onboard OBD System. It Communicates Over The Vehicle CAN Bus With Other Modules And Sensors. Compatibility Depends On Hardware And Software Calibration: The Unit Is Commonly Found On The Above Listed Citroën And Peugeot Models, Often Identified By The Product Codes Included In This Listing.

Replacement Procedure

Typical Replacement Steps For Experienced Technicians Or Knowledgeable DIYers:

• Disconnect The Negative Terminal Of The Battery Before Any Work To Prevent Damage To The Unit Or Vehicle Electronics.
• Locate The ECU According To The Specific Model (Consult Vehicle Manual). Remove Any Protective Covers Or Brackets.
• Carefully Release The Wiring Connector Locks And Unplug All Electrical Connectors. Avoid Pulling On The Wiring Loom.
• Unscrew The Mounting Fasteners And Extract The ECU. Inspect Connectors For Corrosion Or Bent Pins.
• Install The Replacement Unit In Reverse Order. Ensure Connectors Are Fully Seated And Fasteners Correctly Torqued.
• Follow The Required Commissioning Procedure (Cloning Or Initialization/Coding) Before Starting The Engine — See The Section “Installation And Coding – Important” Below.

Installation And Coding – Important

• The Unit Is Used And Is “Paired” With The Original Vehicle (VIN/PIN/Keys).
• Options To Commission The Unit:
  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 Disassembly/Assembly Always Disconnect The Battery And Follow The Manufacturer’s Procedure To Avoid Damaging The Unit.

Recommended For Installation

For Successful Commissioning Choose One Of The Following Approaches: Professional Cloning Of EEPROM/Flash From The Old ECU For Instant Plug‑And‑Play Operation, Or Virginization Followed By Initialization And Telecoding Using PSA Diagnostic Tools. If You Have The Required Equipment And Experience, Cloning Minimizes Programming Steps; Otherwise, Book The Coding Session With A Workshop Equipped With DiagBox/Lexia/PP2000.

Most Common Reasons For Failure

• Water Ingress Or Moisture Corrosion In Connectors Causing Intermittent Faults.
• Heat Cycling And Vibration Leading To Component Fatigue On The Circuit Board.
• Voltage Spikes, Poor Grounding Or Faulty Charging System Causing Electronic Damage.
• Connector Pin Corrosion Or Mechanical Damage During Previous Repairs.
• Sensor Failures Or Short Circuits On Associated Wiring Causing ECU To Log Faults Or Enter Limp Mode.

Search Tips

Customers Often Look Up This Part By Part Number — Use Codes 0261S06472, 9675495080, 9666319180, 1607128580, 1677613380 Or The MEV17.4.2 Family Name To Find Compatible Units Quickly.

Notes For Mechanics And DIYers

This Listing Is Targeted At Professional Mechanics And Experienced Enthusiasts. When Replacing An ECU, Inspect Wiring, Grounds And Sensors To Address The Root Cause Of Failure; Simply Replacing The Unit Without Fixing The Underlying Issue May Lead To Recurrence Of Faults.