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 41 020 Removing and installing/replacing starter (N57 D30 O/T 1)
Necessary preliminary tasks:
- Switch off ignition.
- Disconnect BATTERY NEGATIVE LEAD .
- Remove bottom ACOUSTIC COVER .
- Only F12 and all-wheel drive vehicles:
Remove STIFFENING PLATE .
Release nut (1) and remove cable.
Tightening torque 12 52 1AZ .
Release nut (2) and remove the positive battery cable.
Tightening torque 12 52 3AZ .
Release cable at clamp (3) from starter motor.
Release screws (1), (2) and (3).
Remove starter motor.
Installation note:
Observe screwing sequence .
Position and secure starter motor. Tighten down screws (1) and (2). Tighten down support screw (3).
Tightening torque 12 41 1AZ .
Installation note:
Check starter pinion and ring gear for damage.
If necessary, replace starter motor.
Only during starter replacement and on vehicles with MSA (automatic engine start-stop function):
- Use BMW diagnosis system to reset the starter counter.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.