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To replace the crankshaft sensor on a 3.1 V6 Buick, first disconnect the negative battery cable for safety. Locate the crankshaft position sensor, which is typically positioned near the engine's crankshaft at the rear of the engine block. Remove any necessary components for access, unbolt the sensor, and disconnect the wiring harness. Install the new sensor in reverse order, ensuring it's securely bolted and properly connected before reconnecting the battery.

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