The camshaft position sensor (CMP sensor) on a 1998 Chevy Malibu with the 3.1L engine is located on the
passenger side of the engine, near the front of the cylinder head. It's usually mounted on the
top of the cylinder head, fairly close to the camshaft itself. You'll likely need to look closely to find it. It's a smaller sensor, often with a single-wire connector.
Because it's engine location specific, you may benefit from a picture or diagram for your specific vehicle year and engine. Searching online for "1998 Chevy Malibu 3.1L engine diagram" or "1998 Chevy Malibu 3.1L camshaft position sensor location" along with images may yield better results. A repair manual would be even more helpful.
