12 13 Notes on checking ignition system
WARNING: This page is about a different car, the 2006 BMW X5, 2005 BMW X5, and 2004 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.
Troubleshooting: Fault in fuel injection system
Spark plug faults
Ignition coil faults
Further fault patterns with evaluation
Additional fault notes for troubleshooting
Oscillograms: Normal oscillogram
Oscillograms of ignition coils from different manufacturers
Check: Secondary signal for stationary ignition distribution