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.
1998 BMW 540i AutomaticFACTORY OEM SERVICE PROCEDURE
Engine Electrical System - Repair Instructions
- Troubleshooting
- Spark Plugs
- Ignition Coil
- 12 13 Notes on checking ignition system
- 12 13... Checking Secondary Signal For Stationary Ignition Distribution
- 12 13... Normal oscillogram (M, S, W engines only)
- 12 13 009 Checking ignition coils (M60, M62, S62)
- 12 13 009 Checking ignition coils (secondary coil)
- 12 13 511 Replacing ignition coil (M60, M62)
- 12 13 520 Replacing a spark plug connector (M60, M62, M54)
- Electronic Switching Or Control Unit
- 12 14 520 Replacing impulse sensor (M62)
- 12 14 525 Replacing sensor for cylinder recognition (camshaft sensor) (M60, M62)
- 12 14 550 Replacing control unit (DME) (M52, M62, M54)
- 12 14 610 Replacing right knock sensors (cylinder bank 1 to 4) (M60, M62)
- 12 14 611 Replacing left knock sensors (cylinder bank 5 to 8) (M60, M62)
- 12 14 700 Coding control module (DME / DDE)
- 12 14 705 Programming control unit (DME / DDE)
- 12 63 520 Replacing master relay (M51, M52, M62)
- 61 35... Note on replacing codeable/programmable control units
- Alternator With Drive
- Regulator
- Starter With Mounting
- Starter Lead
- 12 42 500 Removing And Installing Or Replacing Battery Positive Lead (Between Starter, Alternator And Battery Positive Support Point) (M60, M62)
- 12 42 520 Removing and installing/replacing positive battery lead (between alternator and positive battery terminal on cylinder head cover) (M60, M62)
- 12 42 540 Replacing Safety Battery Terminal (SBK)
- Battery In Engine Compartment
- Battery In Luggage Compartment Behind Side Trim Panel
- Battery In Luggage Compartment Under Floor Trim Panel
- Battery in luggage compartment under spare wheel
- Engine Wiring Loom
- Oil Pressure/Oil Temperature
- Switches and Relays
- Sensor For Control Unit
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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