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To disable eco mode on your 2019 Toyota Sienna, you can press and hold the "disp" button on the steering wheel for a few seconds until the option appears while in odometer mode. The ECT Power feature provides a temporary power boost useful for situations like towing heavy loads, climbing hills, or passing cars. It alters transmission shift points and prevents the selection of the highest overdrive gear, so it's best not to keep it activated all the time. Leaving it on won't cause damage to your engine or gearbox, but there are no benefits to using it during aggressive driving maneuvers such as rapid acceleration or sudden braking.
To turn off the eco mode feature on a 2019 Toyota Sienna, press and hold the "disp" button on the steering wheel for a couple of seconds until the option shows up (make sure you are in the odometer mode). The LE Eco trim comes with its own "eco mode" and a specific eco button for additional enhancements.