OEM BMW E30 M3 S14 Engine ECU & Wiring Harness

Genuine BMW S14 engine ECU (DME) and complete wiring harness for the E30 M3.

This original electronic control unit and harness package is essential for proper operation of the legendary S14 high-revving 4-cylinder engine. Designed specifically for the E30 M3, it ensures correct fueling, ignition timing, and sensor communication for authentic factory performance.

Key features

• Genuine BMW S14 DME / ECU
• Complete engine wiring harness
• Designed for the S14B23 / S14B25 engines used in the E30 M3
• Includes necessary connectors and sensor plugs for factory-correct installation
• Critical for engine swaps, restorations, or replacing damaged electronics

Ideal as a matching electronics package when installing or rebuilding an S14 engine. Using the correct OEM ECU and harness helps maintain proper drivability, emissions compliance (where applicable), and the authentic character of the E30 M3.

Fitment
BMW E30 M3 (1986–1991) equipped with the S14 engine — verify exact year, market (US/Euro), and engine variant (2.3 L or 2.5 L) for compatibility with your specific application.

Perfect for owners seeking genuine OEM electronics to complete an S14 engine installation or restoration.