Complete Guide: Peugeot 307 2.0 HDI ECU Engine Control Unit SID803A 5WS40421F-T / SW9663607580

Introduction

Welcome to Automan Spare Parts, the most trusted and reputed source for OEM used and tested ECUs, supplying thousands of customers worldwide. We are widely known across the USA as the No.1 affordable ECU supplier, providing OEM modules at the cheapest market rates with fast global shipping, 30-day warranty, and professional support.

If you are looking for the Peugeot 307 2.0 HDI ECU SID803A (5WS40421F-T / SW9663607580), this complete guide covers everything you need before buying or replacing one.

Complete Guide to Peugeot 307 2.0 HDI ECU SID803A (5WS40421F-T / SW9663607580)

What Is This ECU?

The SID803A Engine Control Unit is the electronic brain of the Peugeot 307 2.0 HDI diesel engine. Manufactured by Siemens/Continental, this ECU manages:

• Fuel injection timing

• Turbocharger control

• Immobilizer communication

• EGR valve management

• Performance and emissions

• Sensor communication and diagnostic functions

Key Identification Numbers

To confirm compatibility, look for these numbers on your ECU label:

• Model: SID803A

• Hardware: 5WS40421F-T

• Software: SW9663607580

• Common Variants: 5WS40421F, 5WS40421FT, 9653958980, 9655041480

Any ECU ending in SID803A is typically interchangeable once programmed.

Symptoms of a Faulty Peugeot SID803A ECU

Recognizing signs early can prevent bigger engine issues. Common symptoms include:

• Hard starting or no start

• Immobilizer fault message

• Random stalling

• Loss of power or limp mode

• Injector circuit errors

• Glow plug circuit faults

• Communication failure with diagnostic tools (CAN BUS errors)

If these issues occur, the ECU may require repair or replacement.

Does This ECU Require Programming?

Yes.
When replacing SID803A / 5WS40421F-T, programming is required.

Programming Options

1. Plug-and-play (if supplied cloned or virginized).

2. Immobilizer programming required if ECU is replaced with a used one.

3. Must be synced with:

   • BSI

   • Key / transponder

   • VIN coding

   • Injector coding

At Automan Spare Parts, we can supply tested plug-and-play options, depending on availability.

Technical Specifications

• Engine compatibility: 2.0 HDI 8V

• Fuel type: Diesel

• ECU type: Siemens SID803A

• Communication: CAN

• Immobilizer: Built-in

• Common vehicles: Peugeot 307, 407, 308, Citroen C4, C5 (varies by code)

Compatibility Table

Vehicle Compatibility Table

Why Buy From Automan Spare Parts?

• No.1 supplier of OEM ECUs in the USA

• Cheapest rates globally

• Fast worldwide DHL / FedEx shipping

• 30-day warranty

• Professional packaging

• All modules tested and quality-checked

• Huge inventory of rare ECU models

Visit us anytime at:
www.automanspareparts.com

TLDR

• ECU Model: SID803A / 5WS40421F-T / SW9663607580

• Fits: Peugeot 307 2.0 HDI and similar models

• Symptoms: No start, limp mode, injector faults

• Requires programming: Yes

• Automan Spare Parts offers OEM ECUs with fast global shipping and lowest prices

FAQ

1. Can I replace the ECU without programming?

No. SID803A requires immobilizer pairing / cloning unless delivered plug-and-play.

2. How do I confirm compatibility?

Match: SID803A, 5WS40421F-T, SW9663607580.

3. Do you ship to the USA and Mexico?

Yes. Automan Spare Parts ships fast worldwide.

4. Do you sell tested OEM ECUs?

Yes. All units are OEM, fully tested, and quality verified.

5. Can I get a full ECU kit?

Yes, depending on stock (ECU + BSI + key).