How do you reset check engine light on an Audi A6?

To reset the check engine light on an Audi A6, you can use an OBD-II scanner to clear the diagnostic trouble codes (DTCs) that triggered the light. Alternatively, you can disconnect the car's battery for about 15 minutes, then reconnect it, which may also reset the light. However, it's important to address the underlying issue that caused the light to come on before resetting it to avoid potential problems in the future. If the light reappears, it's advisable to consult a professional mechanic.