Method for the diagnosis of own operation is a vehicle of a soot sensor in a motor vehicle and / or the detection of other components in the soot

The present invention relates to a method for the diagnosis of own operation to a vehicle of a soot sensor (10) and / or the detection of other components in the soot in a motor vehicle with a combustion engine, the sensor of soot (10) being electrically connected to an evaluation circuit fixedly installed in the motor vehicle. To provide a method for diagnosing operation of a soot sensor (10) and / or the detection of other components in the soot, whereby a soot sensor (10) defective and / or other components in the soot can be detected economically, the evaluation circuit measures the voltage coefficient of the soot sensor (10) and detects the defective nature of the soot sensor (10) and / or the presence of other components in the soot from the voltage coefficient of the soot sensor (10).