Method for detecting interference in a received signal (s) received by a radar sensor (5, 6) of a motor vehicle by means of an electronic computing device of the motor vehicle, wherein for detecting a target object in an environment of the motor vehicle a transmit signal including a sequence of consecutive frequency-modulated chirp signals is transmitted by means of the radar sensor (5, 6) and an echo signal reflected on the target object is received by the radar sensor (5, 6) as the received signal (s) with the superimposed interference, wherein after receiving the received signal (s) by the radar sensor (5, 6), the interference in the chirp signals of the received signal (s) is detected, wherein from the received signals of the same sequence, a receive matrix is provided, in which the samples of the chirp signals of the received signal are indicated, wherein the lines of the receive matrix each include all the samples of a single chirp signal, wherein each line of the receive matrix is then processed one after the other: - wherein a value j is implemented, which is incremented from 1 to N-k, wherein N denotes the number of samples within a line of the receive matrix and k is a preset constant, - wherein for detecting the interference within a subset (s(j:j+k)) of samples of a chirp signal of the received signal (s) from j to j+k, a parameter value (LocVar) is determined, which characterizes a deviation of the samples of the subset (s(j:j+k)) from each other, wherein a local variance of the samples within the subset (s(j:j+k)) is determined as the parameter value (LocVar), - and that depending on the parameter value (LocVar) at least with respect to one of the samples of the subset (s(j:j+k)) it is determined whether or not this sample is affected by interference, wherein depending on the local variance it is determined whether or not the at least one sample of the subset (s(j:j+k)) is affected by interference, wherein the parameter value (LocVar) is compared to a first threshold value, - at least one sample of the subset is interpreted as affected by the interference if the parameter value (LocVar) is greater than the first threshold value, - characterized by the first threshold value and a second threshold value being adjusted in the operation of the radar sensor (5, 6) by means of the computing device, wherein the alteration of the currently adjusted first threshold value and second threshold value is effected on condition that the parameter value (LocVar) is smaller than the currently adjusted first threshold value and on condition that the parameter value (LocVar) is smaller than the second threshold value, which is smaller than the first threshold value. - wherein a value j is implemented, which is incremented from 1 to N-k, wherein N denotes the number of samples within a line of the receive matrix and k is a preset constant, - wherein for detecting the interference within a subset (s(j:j+k)) of samples of a chirp signal of the received signal (s) from j to j+k, a parameter value (LocVar) is determined, which characterizes a deviation of the samples of the subset (s(j:j+k)) from each other, wherein a local variance of the samples within the subset (s(j:j+k)) is determined as the parameter value (LocVar), - and that depending on the parameter value (LocVar) at least with respect to one of the samples of the subset (s(j:j+k)) it is determined whether or not this sample is affected by interference, wherein depending on the local variance it is determined whether or not the at least one sample of the subset (s(j:j+k)) is affected by interference, wherein the parameter value (LocVar) is compared to a first threshold value, - at least one sample of the subset is interpreted as affected by the interference if the parameter value (LocVar) is greater than the first threshold value, - characterized by the first threshold value and a second threshold value being adjusted in the operation of the radar sensor (5, 6) by means of the computing device, wherein the alteration of the currently adjusted first threshold value and second threshold value is effected on condition that the parameter value (LocVar) is smaller than the currently adjusted first threshold value and on condition that the parameter value (LocVar) is smaller than the second threshold value, which is smaller than the first threshold value.