On the 2003 Kia Sedona, the heater plug sensor, also known as the glow plug sensor, is typically located near the engine's cylinder head, adjacent to the glow plugs themselves. It is connected to the engine's wiring harness and monitors the temperature of the glow plugs to ensure proper operation. For precise location and access, it's best to refer to the vehicle's service manual or consult a professional mechanic.
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