►Audi A6 ►Service and care ►Checking and topping up fluids ◀Selective catalytic reduction (AdBlue/DEF)
Applies to: vehicles with selective catalytic reduction
Closing the filler neck
Screw the cap onto the filler neck by turning the box spanner clockwise until you hear the cap click tight WARNING!, Caution!.
Press the left side of the flap to close it (you should hear it click into place).
After refilling
The vehicle must be driven so that the system can detect the AdBlue which has been added. This process can take several minutes.
If the AdBlue tank had run dry and a range of 0 km was shown on the display, switch on the ignition for approx. 30 seconds before starting the engine.
Note
AdBlue can freeze at very low temperatures. In this case, the system will not detect AdBlue when you refill and will continue to indicate a low AdBlue level. The message will disappear as soon as the tank has thawed.