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In a 2010 Ford Focus, you can locate the speed sensor on the passenger side of the transmission at the output shaft. The primary function of this sensor is to monitor the rotational speed of the driveshaft. Once it captures this data, it transmits it to the ECU. The ECU then processes the information to display your current speed on the dashboard speedometer. If the sensor malfunctions, you may observe issues with the speedometer accuracy and receive a check engine light on the dashboard, signaling a communication problem with the sensor that requires replacement.
Situated in the transmission casing by the output flange on the right side for the passenger.