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 ... Normal Oscillogram (N42, N62)
- Start of ignition voltage peak
- Level of ignition voltage
- Level of combustion voltage
- Period of combustion
- Combustion curve characteristics
- Start of decay process
- Termination oscillations
N42 / N62:
The following normal oscillogram is applicable to engines with multiple-spark ignition from the production date of April 2001:
Depending on the engine temperature/speed, some ignition voltage peaks can occur before the typical ignition voltage curve.
These peaks do not play any role for diagnostics.
The last ignition voltage peak (1) before the ignition voltage curve is the decisive factor for the test.
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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.