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Where is the camshaft sensor on a 1991 Buick Park Ave?

The camshaft position sensor (CMP sensor) on a 1991 Buick Park Avenue (assuming it has the 3.8L V6 engine, which was common) is located on the passenger side of the engine, near the front. It's usually mounted on the cylinder head, fairly close to the camshaft sprocket or timing cover.

However, precise location varies slightly depending on the exact engine configuration. You'll need a repair manual specific to your vehicle's year and engine to pinpoint it accurately. A diagram in the manual would be invaluable. Searching online for "1991 Buick Park Avenue 3.8L engine diagram" might help you find one.

Caution: Do not attempt to locate or work on the CMP sensor without the proper tools and knowledge. Improper handling can damage the sensor or the engine.