Engine Electrical System - Repair - E90

Safety Information
- 00 Safety information for working on vehicles with automatic engine start-stop function (MSA)
Troubleshooting
Ignition Wires, Spark Plugs
- 12 12 011 Removing and installing/replacing all spark plugs (N53, N54, N54T, N55, N63, S63)
Ignition Coil
- 12..... Removing and installing/replacing rear ignition coil cover (N55)
- 12 13 511 Replacing ignition coils (N55)
Electronic Switching Or Control Units
Alternator With Drive And Mounting
- 12 31 009 Checking alternator (BSD)
- 12 31 020 Removing and installing or replacing alternator (N54, N54T, N55)
Controller
- 12 32 501 Replacing voltage regulator
Starter With Mounting
- 12 41 020 Removing and installing/replacing starter motor (N54, N54T, N55)
- 12 41 041 Replacing solenoid switch
Starter Lead
- 12 42 500 Replacing positive battery cable between starter motor, alternator and positive battery connection point (N54 N54T N55)
Engine Wiring Loom
- 12 51 001 Replacing wiring harness section for engine (N55)
- 12 51 100 Replacing wiring harness section for ignition and injectors (N55)
Oil Pressure/Oil Temperature/Oil Gauge
- 12 61 285 Removing and installing/renewing oil level sensor for engine oil (N55)
- 12 61 280 Removing and installing/replacing oil pressure sensor (N55)
  - Notes
  - Installation location
Control Unit Box
- 12 90... Removing and installing/replacing electronics box
  - Notes
  - Replacement
- 12 90 100 Replacing fan for electronics box