Seat ALHAMBRA Owner's Manual page 276

274 Checking and refilling levels
Refilling AdBlue
To refill AdBlue, the vehicle must be on flat ground and not, for example,
parked on a kerb or slope. If the vehicle is not on flat ground then the filling
indicator cannot measure the filling quantity.
Fig. 161 At the rear left of
the luggage compart-
ment: AdBlue tank,
behind a cover panel.
Opening the tank filling neck
Open the tailgate.
Fig. 162 AdBlue tank with filler neck cap and refilling
bottle.