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.
Troubleshooting procedure
Troubleshooting is possible only if the fault is actually present. This means: targeted troubleshooting according to instructions (diagnosis/troubleshooting for the individual DTCs) is only possible if the entry has the status 'present' in the fault memory.
If the fault is 'not present' at the moment, it is necessary to check the following:
- Has the fault healing counter and possibly the fault erasing counter been decremented? This would indicate that the fault has been corrected
- Did the fault occur a long time ago? Read out the extended fault memory (operating time and mileage for last fault entry)
- Are the diagnostic conditions fulfilled? Carry out a short test or test drive, if necessary
- Are all the plug connections and ground points of the current path in question OK?
- By pulling and shaking, put all wiring harnesses of the current path in question in a state corresponding to that of driving operation (loose contact).
- Condition/leak tightness of the catalytic converter
- For tank system: Condition/leak tightness of hoses and possibly the tank cap
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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