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 13 Notes on checking ignition system
Troubleshooting -> Fault in fuel injection system. Refer to 12 13 ... FAULT IN FUEL INJECTION SYSTEM .
-> Spark plug faults. Refer to 12 13 ... SPARK-PLUG FAULTS .
-> Ignition coil faults. Refer to 12 13 ... 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 (M, S, W ENGINES ONLY) .
-> Oscillograms of ignition coils from different manufacturers. Refer to 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 .
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.