It's under the air filter housing.
you need to change the input turbine speed sensor
Saab
Turbine input speed sensor
remove the air intake box and look on top of the transmission, there are 2 sensors in the top case. the one closer to the bell housing is the input turbine speed sensor, the other is the output turbine speed sensor
Turbine sensor. For a honda accord 05 lx
Input/Turbine speed sensor malfunction
Transmission
The Turbine Input Sensor is used by the computer to determine transmission speed. There are several back-up sensors that the computer can use in the event the Turbine Sensor fails. A failed sensor will trip the Check Engine light, but the car will still run and you can still drive it.
its located in the valve body of the transmission
P0715
The Mazda Millennia Speed sensor tells the speedometer how fast the vehicle is traveling. Speed sensors are located on top of the transmission housing where they can reach the input shaft. The speed at which the input shaft spins tells the vehicle how fast it is moving.
it controls the overdrive function and shift timing relative to speed