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The throttle position sensor in a 2009 Toyota Corolla is located on the throttle body, opposite the idle control valve. This sensor monitors the amount of air entering the engine. If it malfunctions, the throttle body may fail to operate correctly, leading to difficulties opening or closing. If stuck closed, the engine won't receive air for combustion and won't start. Replacing a throttle position sensor for a Toyota Corolla typically costs between $100 and $170 and should only be done when repair is no longer an option.
The throttle position sensor for a 2009 Toyota Corolla can be found on the throttle body housing, situated across from the idle control valve.