if it has a 3.1 or 3.4 it is located between the engine and the trans just above the oil pan.
where is the crankshaft sensor located on a 1988 cutlass supreme
The Crankshaft sensor is located behind the Harmonic Balancer on the front-passenger side
To change the crankshaft position sensor on a 1999 Oldsmobile Silhouette, first disconnect the negative battery cable to ensure safety. Locate the sensor, which is typically found near the crankshaft pulley; remove any components obstructing access. Disconnect the electrical connector and unscrew the sensor from its mounting position. Install the new sensor by reversing the steps, ensuring it is securely fastened and reconnected before reconnecting the battery.
under the power steering pump in the top of the engine.
On the 3.8 litre engine its located on the forward side under the harmonic balancer. You need to pull the balancer to replace the sensor. The magnetic pick-up on the sensor rides in the stainless steel stotted track on the rear of the balancer.
The crankshaft sensor is in the front of the engine.Above the starter.You will have to drop the starter.2 15mm bolts.Look up and there it will be.
check main pulley area bottom by harmonic balance
Under hood, center, rear engine area, mounted in exhaust manifold
On front cover of engine by crankshaft pulley.
changing the crankshaft sensor
If you know the code number from the computer you google that number and will find your answer. My 3.5 liter then sensor was located behind the starter.
depending on the year, I have a 2002 intrigue, it is located just above the starter, it needs to be removed to remove the crankshaft sensor, 15mm for starter and 10mm for sensor 1 bolt , not to difficult.