The speed sensor in a 2010 Ford Focus can be found on the traveler side of the transmission at the result shaft. This sensor is intended to gauge the rotational speed of Your driveshaft. At the point when this sensor measure the rotational speed it will send that data to Your ECU. From that point the ECU can figure it out and show You the speed that You are going on the speedometer in Your scramble. Assuming this sensor bombs You will as a rule notice that Your speedometer isn't working as expected. You will likewise generally get a check motor light at Your scramble. This will tell You that there has been a correspondence blunder with the sensor and it should be supplanted.