Where is the crank shaft sensor on a 1999 Oldsmobile Intrigue?

On a 2000 Oldsmobile Intrigue with a 3.5L engine it is behind the starter at the front of the car. .

I had to replace the Crankshaft position Sensor on my 99 GL with 3.5L. It was on the backside of the block directly above the starter. To get to it, I unbolted the starter from the transmission and dropped it down a few inches. The Crank sensor is mounted to the block with a single small bolt that is hard to get at, but you can see it. You'll need a fairly flat socket or wrench to work it loose as there isn't much room.

On a 2001 with the 3.5L it is located on the front of the engine, more to the drivers side than the passenger side. You will need a 15 mm socket and an 8 inch extension for the starter bolts. You will need a 10 mm wrench for the plastic shroud which helps support the starter, and also the sensor bolt uses the 10mm wrench as well. I found it easier to slide feet first under the properly supported car to do the work. The higher you can get the car, more arm room you will have as the sensor is in a kind of awkward space.