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 51 200 Replacing wiring harness section for injectors (M57T2) (Version 2)
Necessary preliminary tasks:
- Read out fault memory of DDE control unit; if necessary, work through test schedules
- Switch off ignition
- Remove intake air manifold
E60:
Unlock cover (1) with slide (3).
Unfasten screws (2).
Remove electronics box cover (1).
Unlock and disconnect plug on control unit.
E83:
Unfasten screws.
Remove cover (1).
Unlock and disconnect plug on control unit.
E90:
Unlock fasteners (1) from below and slide upwards approx. 10 mm.
Unlock slide (2) in direction of arrow.
Remove cover (3).
Unlock and disconnect plug on control unit.
Pull out lock (1) in direction of arrow.
Press out plug (2) in direction of arrow.
Unlock plug (1) and remove.
Unfasten screws.
Remove cable duct (2) with wiring harness.
NO RELATED
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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.