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Where is the crankshaft sensor on a 2001 Alero?

The crankshaft position sensor (CKP sensor) on a 2001 Oldsmobile Alero is located on the passenger side of the engine block, near the crankshaft pulley. It's usually a relatively small sensor with a single wire connector. You'll likely need to look underneath the car for the easiest access. However, the exact location might vary slightly depending on the engine (2.2L or 3.4L).

Because of its location and the potential for oil and grime buildup, accessing it might require some maneuvering and possibly some cleaning before you can get a good look at it. A repair manual specific to your year and engine size would give the most accurate and detailed location.