My car is a modern Tucson, and it has already run 12000 kilometers. Do I have to clean the throttle and idle motor?

It doesn't have to be washed. It depends on usage. If there are too many kilometers, there is carbon deposit in the throttle valve, which will affect the intake. When driving, you won't feel that the air intake is insufficient, the cold car is not easy to start, and the fuel consumption increases. I suggest that it is necessary to wash it once every 20 thousand kilometers. It will be better if the idle valve is removed and washed, and it does not need to be equipped.