A 2010 Shanghai Volkswagen Skoda Hao 1.8TSI car with a mileage of about 90 thousand km. User response: the vehicle is difficult to start and idling. Inspection analysis: the maintenance personnel detected the engine control unit, and found the fault code P0341 - the intake camshaft position sensor fault and the P0011 - intake camshaft phase over - advance. When the engine is running at idle speed, the data flow is checked, and the load rate has reached 33%., which indicates that if the intake camshaft phase error is credible, the phase overlap of the intake and exhaust stroke has resulted in the combustion anomaly of the mixture gas.