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The recommended power steering fluid for a 2003 Toyota Corolla is Automatic Transmission Fluid Dexron II or III. Another option is Valvoline Conventional Transmission Fluid Mercon V. The function of power steering fluid is to assist the driver in making seamless turns, ensuring smooth operation of the power steering system and extending the pump's lifespan. If you notice roughness in your wheel movements during turns, it could be due to low power steering fluid. Thankfully, adding more is a simple task. Just unscrew the cap and pour in fluid up to the MAX line.
The power steering fluid for a 2003 Toyota Corolla is recommended to be Dexron III.