What is the reason for Mercedes-Benz speed sensor?

This fault code is that the sensor on the computer version is fast and needs to be replaced. Last time I reported this fault code to Mercedes-Benz, I went to several auto repair shops and told me that the gearbox was broken. Later, I went to Shenyang Xincheng automatic gearbox to specialize in his home, only to know that the sensor was broken, which saved me a lot of money. The maintenance technician is very careful and has a good service attitude. The address is South Seventh Middle Road, Degong Street 143-3.