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The article presents an analysis of research on a series of passenger vehicles equipped with diesel and spark-ignition engines of modern generation. These studies show the attempt to determine the consistency of the measurement results presented by the electrical motor with respect to the external direct measurements determining the level ecological driving unit such as a gas analyzer. The premise of this material is to assess the suitability of the read actual parameters sent by the ECU as the data source the level of organic vehicle, for example. The test for diagnostic station with annual regular reviews. The inspiration for the material was the attempt to determine the sensitivity of the self-diagnosis system of the propulsion unit, which correctness of the diagnosis itself is one of the criteria of the positive periodic test guidelines.

The article presents the analysis of electrical signals and system reports of motor vehicles in which the mileage counter indication has been questioned under service conditions as compared to the vehicles mechanical wear and tear. The essence of the aforementioned deliberations is an attempt at determining the universal procedures allowing for obtaining data concerning the actual vehicle mileage. Search for the intended method results from many factors functioning on the used motor vehicle market. The major factor is the uncontrolled safety level on the roads among the road users and, equally important, financial frauds in the area of motor vehicle sales, as well as vehicle cost estimation by the insurance companies.