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To change the PCV valve in a 2003 Toyota Avalon, first, locate the valve, which is typically found on the valve cover. Disconnect the vacuum hose attached to the PCV valve and twist the valve counterclockwise to remove it from its slot. Install the new PCV valve by inserting it into the same slot and twisting it clockwise until secure, then reconnect the vacuum hose. Finally, start the engine and check for any vacuum leaks or irregular noises.

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