Description
Injection Control Unit Continental Siemens SID 803. It is from a 2004 Peugeot 307 2.0 HDi RHR.
This Siemens VDO / Continental SID803 engine control unit (ECU) is a direct-fit replacement for vehicles using the listed product codes and is a sought-after spare part by professional technicians and experienced DIYers. Often searched by product number (for example 5ws40029R-T or 9655041480), this ECU manages fuel injection, timing strategies and engine sensors to keep HDi diesel engines running smoothly. If your Peugeot 307 displays engine warning lights, poor starting, loss of power or irregular idling, replacing or reprogramming the SID803 unit is a common and effective repair path.
Key Features And Benefits
Designed to control common-rail injection systems on compatible PSA diesel engines, the SID803 coordinates injector pulses, turbo boost control inputs, EGR feedback and sensor diagnostics. Replacing a faulty ECU can restore drivability, improve fuel economy and clear persistent fault codes when the failure source is electronic rather than mechanical. Technicians will appreciate that this unit uses the original OEM product codes, which simplifies identification during diagnostics and parts ordering.
Technical Information
- Manufacturer: Continental / Siemens VDO
- Model: SID803 Injection Control Unit
- Product Codes: 5ws40029R-T, 9655041480
- Additional Numbers: 9658212380, 1942PP, NFP
- Original Fitment: Peugeot 307 (2004) 2.0 HDi, Engine Code RHR
Installation Recommendations
- Before starting any work, disconnect the vehicle battery to avoid electrical damage and follow the manufacturer’s safety procedures.
- Locate and access the ECU (position varies by vehicle: commonly mounted in the engine bay or under protective covers). Remove surrounding covers or brackets as required to reach the unit.
- Carefully unplug all wiring connectors — avoid bending pins and protect connector locks. Unbolt the unit using appropriate tools and torque values when refitting.
- Install the replacement ECU, reconnect all plugs and reattach covers. Reconnect the battery only after the unit is securely mounted and connectors are locked.
- Because this is an injection ECU, commissioning is usually required (see the Installation and Coding – Important section below).
Installation And Coding – Important
- The unit is used and is “paired” with the original vehicle (VIN/PIN/keys).
- Options for commissioning:
- Cloning data from the old unit (EEPROM/Flash) – after cloning the unit is plug and play.
- 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 removal/installation always disconnect the battery and follow the manufacturer’s procedure to avoid damaging the unit.
Why This Part Fails
Common causes of ECU failure include water ingress and connector corrosion, heat-related degradation of internal components, voltage spikes from poor battery or charging system conditions, and cracked solder joints from long-term thermal cycling. Failures typically appear on higher-mileage or older vehicles and present as intermittent faults, no-start conditions, limp-home mode or persistent engine fault codes that cannot be resolved by sensor or actuator replacement alone.
Practical Notes For Mechanics And DIYers
- Search By Code: When sourcing this ECU, use the product codes (5ws40029R-T, 9655041480, 9658212380) to match exactly — many technicians search by these numbers to ensure correct fitment.
- Diagnostic Steps: Before ECU replacement, confirm a fault with a full diagnostic scan, check power/ground at the ECU connector and inspect for water or corrosion.
- Professional Commissioning: After physical installation, cloning or coding is usually required to restore full functionality. Attempting to drive without proper initialization can leave the vehicle immobilized or with limited engine performance.
Suitable for workshops and competent home mechanics familiar with diesel ECU handling and PSA coding procedures. If you require an ECU with these codes for a Peugeot 307 2.0 HDi (RHR), this SID803 unit is a direct-match option when used or cloned/coded correctly.
