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.
2004 BMW 545i AutomaticFACTORY OEM SERVICE PROCEDURE
12 13 Notes on checking ignition system
Troubleshooting:
- -> Fault in fuel injection system.
- -> Spark plug faults.
- -> Ignition coil faults.
- -> Further fault patterns with evaluation. Refer to 12 13 ... FURTHER FAULT PATTERNS WITH EVALUATION .
- -> Additional fault notes for troubleshooting. Refer to 12 13 ... ADDITIONAL FAULT NOTES FOR TROUBLESHOOTING .
Oscillograms:
- -> Normal oscillogram. Refer to 12 13 ... NORMAL OSCILLOGRAM (N42, N62) .
- -> Oscillograms of ignition coils from different manufacturers.
Check:
- -> Secondary signal for stationary ignition distribution. Refer to 12 13 ... CHECKING SECONDARY SIGNAL FOR STATIONARY IGNITION DISTRIBUTION .
Factory Service Tools
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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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