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The 2007 Toyota Sienna has the speed sensor placed on the differential cover of the transmission. These sensors play a crucial role in calculating the gear ratio of the transmission in real-time. Typically, there are two sensors that work together to ensure accurate transmission information reaches the vehicle's powertrain control module. One is called the input shaft speed sensor, which monitors the transmission's input shaft speed. The other is the output shaft speed sensor. Any misalignment or electrical problems with these sensors can affect the transmission's performance as a whole.
The speed sensor of the Toyota Sienna is positioned on the differential cover of the transmission.