Description
Injection Control Unit Continental SIEMENS SID 803A. It is from a 2007 Citroën C8 2.0 HDi RHK.
High-quality injection control unit (ECU) produced by Continental / Siemens VDO, marked SID 803A. This unit controls fuel injection, timing and communication with sensors for the 2.0 HDi RHK diesel engine. Supplied with original part references that technicians frequently search for: 5WS40611B-T, 9661642180, 9664610980, 1942JF. Ideal choice for professional mechanics and knowledgeable DIY enthusiasts who need a direct replacement ECU for Citroën and Peugeot vehicles using the SID803A platform. Using the correct ECU restores precise fuel metering, improves drivability and eliminates injection-related fault codes when fitted and configured correctly.
Applications
Fits Vehicles:
- Citroën C8 (2007) 2.0 HDi — Engine Code RHK
- Peugeot 807 — Models Equipped With Compatible 2.0 HDi RHK Engines
Symptoms Of A Faulty Unit
- Engine Does Not Start Or Intermittently Fails To Start
- Rough Idle, Misfires Or Reduced Power
- Illuminated Engine Or Injection Warning Lamp And Related Fault Codes
- Intermittent Stalling Or Loss Of Communication With Sensors/Actuators
How Replacement Is Performed
General replacement steps used by professionals and experienced DIYers:
- Disconnect The Battery Negative Terminal And Wait A Few Minutes To Remove Power From Electronics.
- Locate The ECU (Typically Mounted In The Engine Bay Near The Firewall Or Under The Passenger-Side Dashboard On PSA 2.0 HDi Models).
- Release Any Engine Covers Or Heat Shields That Block Access, Then Unplug Electrical Connectors — Mark Or Photograph Connectors To Ensure Correct Reconnection.
- Unscrew The Mounting Bolts And Remove The Old Unit. Fit The Replacement Unit In The Same Orientation And Securely Tighten The Fasteners.
- Reconnect All Plugs Firmly, Reconnect The Battery, And Perform A Diagnostic Scan To Clear Fault Codes.
- Depending On Vehicle Configuration, Immobilizer Synchronization Or ECU Programming May Be Required Using A Manufacturer-Level Diagnostic Tool (For Example DiagBox/Lexia On PSA Vehicles).
Installation Recommendations
- Perform Work In A Dry, Clean Environment To Avoid Moisture Or Contamination Entering Connectors.
- Observe Electrostatic Discharge Precautions (Disconnect Battery And Avoid Touching PCB Contacts Directly).
- Inspect Connector Pins And Wiring Harness For Corrosion Or Damage Before Reconnection; Repair Any Damaged Wiring To Prevent Recurrence.
- Use A Suitable Diagnostic Tool After Fitting To Clear Historic Fault Codes And Confirm Communication With The ECU.
- If Immobilizer Or Key Recognition Is Lost After Replacement, Use A Manufacturer Diagnostic System To Re-Synchronize The ECU With The Vehicle.
Why This Part Most Often Fails
- Age-Related Component Degradation And Solder Joint Fatigue After Many Years Of Thermal Cycling.
- Water Ingress Or Corrosion From Poor Seals Or Damaged Connector Boots.
- Electrical Overvoltage Or Voltage Spikes (Faulty Charging System, Jump-Starting Errors, Poor Grounding).
- Mechanical Damage From Impact Or Improper Handling During Previous Repairs.
Technical Information
- Manufacturer: Continental / Siemens VDO
- Model: SID 803A
- Product Codes: 5WS40611B-T
- Other Numbers: 9661642180, 9664610980, 1942JF
This ECU Is Supplied With The Identified Part Numbers To Help You Find The Correct Replacement Quickly. The Unit Is Suitable For Mechanics Who Need A Direct-Fit Injection Control Module For PSA 2.0 HDi Engines And For DIYers Comfortable With Basic Diagnostic And Reprogramming Procedures.
