Abstract: A method for determining a filling level of a fluid tank in a motor vehicle, enables both a detection of an ascent or a descent of the motor vehicle with the aid of multiple pieces of position data ascertained in succession via a position determination system, and a plausibility check of the measuring value of the filling level sensor, in that a grade of an associated route section is ascertained for the ascertained position data, a selection of at least two route sections having different grades is carried out, and a measuring value of the filling level sensor to be expected is ascertained for each of them, and a comparison of the measuring values to be expected with the measured measuring values is carried out.

Abstract: A method for determining a filling level of a fluid tank in a motor vehicle, enables both a detection of an ascent or a descent of the motor vehicle with the aid of multiple pieces of position data ascertained in succession via a position determination system, and a plausibility check of the measuring value of the filling level sensor, in that a grade of an associated route section is ascertained for the ascertained position data, a selection of at least two route sections having different grades is carried out, and a measuring value of the filling level sensor to be expected is ascertained for each of them, and a comparison of the measuring values to be expected with the measured measuring values is carried out.