Replace Toyota Sienna Vehicle Engine Parts. Find Toyota Sienna Vehicle Engine & Toyota Sienna Engine Drive Belt Replacement Get Toyota Sienna Engine Parts. Maintaining the engine of your Toyota Sienna is critical for performance and longevity. Regular oil changes, air filter replacements, and timely belt inspections are essential for keeping the engine in peak condition. Signs like unusual noises, excessive smoke, or a drop in fuel efficiency often signal the need for an engine replacement. For those seeking a new heart for their Sienna, options range from the efficient 2.7L 4-cylinder to the robust 3.5L V6, each offering a balance of power and fuel economy. Ensure you select high-quality materials and follow manufacturer guidelines during installation to maximize the engine's lifespan, ensuring your Sienna runs smoothly for miles to come.