Where is the speed sensor located in the 2007 Sienna?

The 2007 Toyota Sienna has the speed sensor located on the differential cover of the transmission. Transmission speed sensors are used to calculate the actual gear ratio of the transmission while in use. There are generally two-speed sensors that work in conjunction to provide accurate transmission data to the vehicle's powertrain control module. The first is known as the input shaft speed (ISS) sensor. As described, this sensor is used to monitor the speed of the transmission's input shaft. The other sensor is the output shaft speed (OSS) sensor. If either of these two sensors falls out of alignment or experience electrical issues, it impacts the operation of the entire transmission.