In various brands of cars, the car engine P1520 Code is found. The engine P1520 is the main thing to check is to confirm the process of the VCT solenoid. You are observing for a stabbing or stuck VCt solenoid valve instigated by adulteration. Mention to car precise repair manual to achieve section tests for the VCT unit. The engine should be fixed properly and it can be fixed properly by the automobile engineer. According to the check list and those are Sensor Heater Circuit Malfunction, injection lump Fuel Metering Control ‘B’ High and Timing Orientation High Resolve Signal A Too Many Pulses.