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The account of a real technical condition of the equipment of the locomotive at planning of volumes of its repair is one of the major reserves of reduction of working costs of railways and decrease in the cost price of transportations. The continuous control of a technical condition of the locomotive in operation is carried out with use of stationary and onboard means of technical diagnostics. The increasing of operational profitability and reliability of diesel locomotives demands continuous control for a technical condition of their equipment in the service. The wide-band exhaust gases oxygen content sensor can be used for continuous monitoring of the air excess coefficient in the locomotive diesel engine cylinders. This type sensors are widely used in automotive diesel engines control systems. It means for indirect estimation of the engine cylinders mixture quality by the exhaust gases oxygen content.