Mercedes s350 has a high idle speed. . There is no air leakage. What's the problem? There's nothing wrong with it

Usually, there are several reasons for high idle speed.

First, the idle valve is damaged. It is recommended to check or replace the idle valve.

Second, the signal of the throttle position sensor is wrong or there is no signal. .

Third, the air intake pipe leaks, especially for cars with intake pressure sensors.

Fourthly, there is something wrong with the electronic control system, so it is suggested to read the data stream with a decoder.

I hope I can help you. Have a nice trip! If there is something wrong with your car, ask the car mechanic. 4S shop professional technician, 10 minutes to solve.