Product Description

Replace your faulty or immobilized engine electronics with this OEM BMW ECU Kit, part number 8506199, designed for the BMW 5 Series E60/E61 LCI 520d with N47 diesel engine.

This is a matched DDE + CAS3 + Key set, providing a complete plug-and-play solution for ECU failure, immobilizer issues, or no-start problems. When installed as a full kit, it ensures proper synchronization between the engine control unit and vehicle security system.

What’s Included

• DDE Engine Control Unit (ECU)
• CAS3 Immobilizer Module
• Matching Key / Transponder
• Additional synchronized components (if included in donor set)

👉 All parts are matched and coded together from the same vehicle

Features

• OEM BMW ECU KIT (DDE + CAS3 + Key)
• Part Number: 8506199
• N47 Diesel engine compatible
• Fits BMW E60 / E61 LCI 520d
• Plug-and-play when installed as full matched set
• Solves ECU + immobilizer synchronization issues
• Direct OEM replacement solution

Condition

Used / OEM (tested working unless otherwise stated)

Important Notes

• Must be installed as a complete matched kit
• May still require minor coding depending on vehicle configuration
• Professional installation recommended
• Please verify compatibility before purchase

Common Symptoms Fixed

• Engine will not start
• Immobilizer / CAS mismatch
• ECU failure or communication errors
• Key not recognized
• Fault codes related to DDE system

Fitment

BMW 5 Series:

• E60 LCI
• E61 LCI
• 520d (N47 diesel engine)

Return Policy

Returns are accepted within 14 days of delivery. Items must be returned in the same condition as received and in the original packaging.

The buyer is responsible for return shipping costs.

Any customs fees, taxes, or import duties are the responsibility of the buyer.

All parts are used OEM components. We are not responsible for installation issues, coding requirements, or labor costs. Please ensure compatibility with your vehicle before purchasing.