An Audi check-engine light is a warning that the ECU detected a fault. It does not identify one specific failed part by itself.
Common areas that may be involved
- Ignition and misfire faults.
- Airflow or boost leaks.
- Fuel-delivery concerns.
- Sensor readings outside expected range.
- Emissions-related faults.
What should happen next?
Read the stored fault codes, check live data and test the system related to the code before replacing components.
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