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How to replace the battery in the remote control of the 2021 Toyota Sienna.

Model: Toyota Sienna Xl40 - Years 2021-2026
Part: Key

To correctly replace the battery inside the key of your 2021 Toyota Sienna, simply follow the steps outlined in this new guide. First, purchase a new battery, making sure it is the correct model, which is CR2450. Next, take the key of your Toyota Sienna and remove the protective back cover. Then, remove the old, depleted battery and replace it with the new one. Finally, reassemble the protective cover properly, and the procedure is complete.

Posted on 27 November 2025 by ScegliAuto

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