This bulletin applies to all 2017-2025 Audi vehicles. The coolant warning light may appear in the instrument cluster. You may find that the coolant level is between the minimum and maximum, as it should be.
Due to the large coolant circuit capacity, there is a significant fluctuation in the coolant level when the engine cools down and heats up. If the coolant is incorrectly filled or bled, this can lead to sporadic illumination of the low coolant level warning light.
The coolant level in the expansion tank must be checked/set according to the Elsa repair manual, while the engine is cold.
Carefully check the connector pins/contacts. The contact surface of the pins and connector must be free of dirt and must not be damaged. After unplugging and plugging in the connector, perform a key cycle and check if the concern returns.
