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How can I inspect the transmission fluid on a 2012 Sienna?
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In 2012, the Toyota Sienna comes with a sealed transmission, meaning there's no dipstick or easy way to check the transmission fluid level. While it's designed to be "maintenance-free," it's always good to be cautious because things are rarely as simple as they seem, whether it's with trucks or even spouses. If you're unsure about the fluid levels, it's advisable to perform a complete drain and fill. To do this, you'll need several tools and a lot of patience. Gather a 24mm socket, a 14mm socket, a 5mm hex socket or allen key, 5 quarts of Toyota ATF WS fluid, copper wire, a crush washer (recommended), a bottle pump with hose, and a drain pan. Follow the detailed instructions provided by user ForTech on ToyotaNation, which can be found at this link: https://www.Toyotanation.com/threads/the-official-how-to-atf-drain-and-fill.323590/. Even though the guide is intended for the 2nd Generation Tacoma, the steps are also applicable to the Sienna.
More answers
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The 2012 Toyota Sienna does not have a fluid dipstick for checking the transmission fluid. These types of transmissions are built to require no maintenance. Instead of a dipstick, your vehicle may have a test valve located at the underside of the engine. To check the transmission fluid, ensure that the car is on a level surface. It is advisable to have a mechanic with proper equipment, like a hydraulic lift or an underground bay, conduct this test. If there is any leakage of fluid, it should be addressed by a mechanic familiar with this transmission type.
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