Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
12 51 100 Replacing Wiring Harness Section For Ignition Coil (N73)
Necessary Preliminary Tasks:
- Read out fault memory of DME control unit.
- Remove manifold. Refer to 11 61 050 REMOVING AND INSTALLING INTAKE AIR MANIFOLD (N73) .
Release grounding points (1).
Release grounding points (1).
Disconnect plug connections (1) on rod-type ignition coils. Refer to 12 13 009 CHECKING ROD-TYPE IGNITION COILS (M54, M56, N40, N42, N45, N46, N52, N62, N73) .
Disconnect plug connections (1) on rod-type ignition coils. Refer to 12 13 009 CHECKING ROD-TYPE IGNITION COILS (M54, M56, N40, N42, N45, N46, N52, N62, N73) .
Unscrew bolt (1).
Release retaining clip (2).
Remove cover (3).
Installation:
Install profile seals correctly to ensure watertightness.
Disconnect plug connection (1).
Disconnect plug connection (2).
Disconnect plug connection (3).
Assemble engine.
Check function of DME.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.