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How do you reset the AdBlue warning light on the Audi A4?
Model: Audi A4
B9
- Years 2014-2024
When the AdBlue warning light appears on the instrument panel of the Audi A4, it means that a generic problem has occurred in the emissions reduction system that is present in diesel engine cars: first of all, it will be necessary to ensure that the additional fluid is sufficient inside the system. If the fluid has been topped up correctly, it will be necessary to check for damage to the AdBlue injectors or any leaks; the problem could also involve certain sensors in the system that may need to be replaced to solve the issue.
Posted on 5 November 2025 by ScegliAuto
Video tutorial
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