This procedure applies to automatic transaxles only. On 2011 and earlier models, the output speed sensor is located on the rear of the transaxle facing the firewall. The input speed sensor is located on the front of the transaxle. 2012 and later CVT transaxles use three speed sensors: primary, secondary and output. The primary sensor is located on the outboard side of the transaxte, facing the left wheel. The secondary sensor is on the rear of the transaxfe, facing the firewall, and the output sensor is at the rear, facing the left wheel. 2013 and later 4AT transaxfe use only an output speed sensor. It is located on the top of the transaxle. For 2011 and earlier automatic transaxle models, remove the air duct and air filter housing. Remove the output sensor shield. Disconnect the electrical connector, then remove the bolt and detach the sensor from the transaxle. Discard the O-ring. Apply some transmission fluid to the new O-ring and install it on the sensor. Installation is otherwise the reverse of removal. For 2012 and later CVT transaxle models, loosen the left front wheel lug nuts. Raise the vehicle and support it securely on jackstands, then remove the left front wheel. Remove the left fender inner fender splash shield. Disconnect the speed sensor electrical connector. Remove the mounting bolt and remove the sensor. Discard the O-ring. Apply some transmission fluid to the new O-ring and install it on the sensor. Installation is otherwise the reverse of removal. For 2013 and later 4AT transaxle models, disconnect the sensor electrical connector. Raise the vehicle and support it securely on jackstands. Working from the rear of the transaxle assembly, remove the sensor mounting bolt and remove the speed sensor. Discard the O-ring. Apply some transmission fluid to the new O-ring and install it on the sensor. Installation is otherwise the reverse of removal.