Description
SAGEM control unit for Peugeot 206 1.4i
High-quality engine control unit (ECU) SAGEM S2000-2A designed for Peugeot 206 1.4i. This unit corresponds to OEM part numbers 9644625680, 9646988680 and device codes 1940W1 / 1940W2. Ideal for professional workshops and skilled DIY mechanics who need a direct replacement ECU to restore correct fuel injection, ignition control and engine management. The part is compatible with typical petrol 1.4i applications fitted with the Sagem S2000-2A platform; search terms such as “ECU Sagem S2000-2A”, “9644625680”, “Peugeot 206 ECU” will help you locate this item quickly.
Technical Information
- Manufacturer: SAGEM
- Model: S2000-2A (Engine Control Unit for Peugeot 206 1.4i)
- Product Codes: 9644625680, 9646988680, 1940W1, 1940W2
- Other Numbers: 1940W1, 1940W2, NFP
Compatibility
Commonly fitted to Peugeot 206 1.4i petrol models that use the Sagem S2000-2A ECU family. Always verify part numbers stamped on the original unit before replacement to ensure correct match.
Function
The ECU manages fuel injection timing and quantity, ignition timing, idle control, sensor signal processing (e.g. crankshaft position, throttle position, MAP/MAF, coolant temperature, oxygen sensors) and on-board diagnostics (OBD). Proper ECU operation is essential for fuel efficiency, emissions control and driveability.
Typical Symptoms Of A Faulty Unit
- Engine does not start or cranks but does not fire.
- Intermittent stalling, misfires or sudden loss of power.
- Irregular idle speed or surging at idle.
- Multiple unrelated fault codes stored in the ECU, or impossibility to read/communicate with the unit on diagnostics.
Common Causes Of Failure
Failures are frequently caused by water ingress, corrosion on connector pins, thermal stress, vibration leading to cracked solder joints, or damage from incorrect jump-starts and other electrical faults. Age-related component degradation and poor environmental protection are common contributors.
Replacement Procedure (Overview)
- Disconnect the negative battery terminal before starting work.
- Locate the ECU (location varies by vehicle; may be in engine bay or inside passenger compartment). Remove any protective covers or brackets.
- Carefully unplug electrical connectors—do not pull on wiring. Unscrew and remove the ECU.
- Install the replacement unit in reverse order, ensuring secure mechanical mounting and clean, corrosion-free connector contacts.
- After mechanical installation, perform the required cloning or coding procedure so the replacement unit is recognized by the vehicle.
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 technician 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
- Work with a clean, dry environment and avoid touching the ECU circuit board. Use anti-static precautions where possible.
- Inspect connector terminals and wiring harness for corrosion or damage; repair any wiring faults before fitting the new unit.
- If programming/cloning is required, use proper PSA diagnostic tools or entrust the task to a qualified workshop to ensure correct initialization and key adaptation.
- Do not attempt to hot-swap the ECU with the battery connected—this risks permanent damage.
Why This Part Usually Fails
ECUs in older Peugeot 206 vehicles are often exposed to harsh engine-bay conditions: heat cycles, moisture penetration, and vibration. Connector corrosion or water ingress is a frequent root cause. Electrical incidents such as short circuits, incorrect jump-starts, or faults in other components (e.g. alternator or wiring harness) can also damage the ECU’s internal electronics.
For professional mechanics and experienced DIYers, this SAGEM S2000-2A ECU offers a direct-match solution when the original part numbers correspond. Proper handling and correct commissioning (cloning or coding) are key to restoring full engine management functionality.
