Description
SAGEM Engine Control Unit for Peugeot 206 1.4i
High-quality SAGEM ECU (S2000-2A) designed for Peugeot 206 1.4i engines. This genuine OEM injection control unit matches original part numbers and is a direct replacement for vehicles equipped with the corresponding engine management system. Ideal for professional workshops and experienced DIY mechanics who need a reliable engine control solution that restores proper fuel injection, ignition timing and emission control. Commonly searched by reference numbers such as 9644625680, 9646988680, 1940W1 and 1940W2, this unit improves drivability, idle stability and throttle response when the original ECU is faulty.
Technical Information
- Manufacturer: SAGEM
- Model: Peugeot 206 1.4i
- Product Codes: 9644625680, 9646988680, 1940W1, 1940W2
- Other Numbers: 1940W1 (S2000-2A platform), NFP / Stellantis References
Compatibility
Compatible With: Peugeot 206 1.4i (vehicles using the SAGEM S2000-2A injection management). Always check the part numbers listed above against the unit being replaced to confirm fitment.
Function And Benefits
The ECU controls fuel injection timing, ignition advance, idle management, lambda feedback and failsafe strategies. Replacing a faulty ECU restores correct sensor interpretation and actuator control, eliminating misfires, rough idle, stalling and check engine warnings related to the engine management system.
Typical Faults And Causes
- Electrical Damage: Voltage spikes, battery jump-starts or poor wiring can damage internal electronics.
- Moisture Ingress And Corrosion: Water penetration or corrosion on connectors leads to intermittent faults or complete failure.
- Thermal Stress: Repeated heating and cooling cycles may cause solder joint failures or PCB cracks.
- External Component Failures: Faulty sensors or shorted actuators can overload the ECU and cause secondary damage.
- Age-Related Degradation: Capacitor aging and connector wear over many years of service.
How Replacement Is Done
Basic Replacement Steps (for experienced technicians/DIY with suitable tools):
- Disconnect The Negative Battery Terminal Before Any Work.
- Locate The ECU — Typically Mounted In The Engine Bay On The Bulkhead Or Under A Protective Cover On Peugeot 206 Models.
- Remove Protective Covers And Unplug All Connectors Carefully; Release Any Connector Locks To Avoid Pin Damage.
- Unscrew The Mounting Fasteners And Remove The Old Unit.
- Fit The Replacement Unit, Reattach Mounting Fasteners And Reconnect The Electrical Connectors Securely.
- Commissioning: Follow The Coding/Cloning Procedure (See Installation And Coding Section Below).
- Reconnect The Battery And Verify Operation. Clear Any Historical Fault Codes After Proper Commissioning.
Installation And Coding – Important
– The Unit Is Used And Is “Paired” With The Original Vehicle (VIN/PIN/Keys).
– Options To Commission:
1) Clone Data From The Old Unit (EEPROM/Flash) – After Cloning The Unit Is Plug And Play.
2) Virginize And Subsequent Initialization/Telecoding Via DiagBox (Or 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.
Recommendations For Installation
- Perform Cloning Or Coding With Professional Diagnostic Tools To Ensure Immobiliser Matching And Full Engine Functionality.
- Inspect And Clean Connector Pins And Harness Grounds Before Reconnection To Prevent Future Intermittent Faults.
- Use Correct Torque Values For Mounting Fasteners And Replace Any Damaged Grommets Or Seals To Prevent Moisture Ingress.
- When In Doubt, Have A Qualified Technician With PSA Diagnostics Perform The Final Coding And Key Adaptation.
Why This Part Fails Most Often
Failures Most Frequently Result From Electrical Surges, Water Ingress Around Engine-Bay Mounting Points, Corroded Connectors And Long-Term Thermal Stress. Replacing The Unit Without Addressing Wiring Or Sensor Faults May Result In Repeated Failures — Always Diagnose Root Causes Before Installing A Replacement ECU.
Who Should Buy
Recommended For Professional Mechanics And Competent DIYers Repairing Peugeot 206 1.4i Vehicles Who Need An OEM SAGEM S2000-2A ECU Identified By The Above Part Numbers. The Unit Is Suited For Restoring Proper Engine Management When The Original ECU Has Failed.
