The sagitar only traveled 19488 km. The 4s shop has detected that the throttle has serious carbon deposition and needs to be cleaned. Is the engine normal?

The reasons for carbon deposition are complicated, and most of them are related to your driving habits. If you usually drive a short distance, drive slowly and have a gentle driving style, you will definitely have serious carbon deposition. Run more at high speed, step on the gas, and don't be stingy when refueling. It will be much better, and it will be cleaned after about 40 thousand kilometers. Otherwise, 20000 cleaning is normal. Serious carbon deposition will lead to unstable idle speed, especially in winter, which will lead to driving difficulties. Return the oil.