Where is the crankshaft position sensor on a 94 buick lesabre?

Your Crankshaft Position Sensor is located behind your Harmonic Balancer.

To replace, remove your serpentine belt from the harmonic balancer. Remove your right wheel and inner fender cover. Obtain a harmonic balancer puller. Most auto parts stores will rent them to you. The puller kit probably won't have the right bolts for your 94 Lesabre. At your local hardware store, buy 3 metric bolts, M6-1.25 x 70mm. If you can get flange bolts it is better, but a fender washer on each bolt will work if you get regular bolts. I learned this the hard way. Before removing the harmonic balancer, you must remove a little inspection plate on the transmission so you can clamp the flex plate in place. There is a special tool for this, but a pair of vise grips will work nicely, just clamp them on the flex plate tightly and be careful not to damage the plate's teeth. Now remove the center bolt on the balancer, attach the puller through the three holes and slowly tighten the center screw till the balancer slides off. Once off, you will see the electrical connection for your crank sensor just to the right of where the balancer was mounted. There is a plastic cover that you must remove. With a bit of gentle prying, it will come off. Now you have access to the two bolts holding the sensor on. While down there, look just above and to the left of where the balancer was and you will see another electrical connector. That is for your cam position sensor. One bolt is all that holds it in, but it has an o-ring so if you need to replace it as well, it will also take a little gentle prying. Reassembly is everything in reverse. Be careful to align the key-way in the balancer with the key on the crank shaft as you reinstall it. Autozone.com has everything you need to know including instructions. That's where I learn. Check there for the torque specs for the balancer bolt. I think it is somewhere around 120 foot pounds.