Regarding the question you asked, if it is the voice of the 4s shop after the inspection, you can try changing the oil first. Adding inferior oil or low-grade gasoline will cause knocking (shouting). It is suggested that the vehicle try to change to a gas station first, which is probably related to the gasoline added by the vehicle. Secondly, the working temperature of the engine is too high, the air leakage in the intake system causes the mixture to be too lean, the compression ratio does not match the fuel label, the engine has too much carbon deposit, the engine climbs when running at high speed, and the knock sensor fails, all of which will lead to the engine knocking. I hope my answer is helpful to you.