I have a 1996 3.1 olds . The crank sensor is bad . It is located on back of engine block under ex manifoild ,can hardly see it. How do I get to it to remove? Please help!

Crawl under the car and you can get it from there.
BE CAREFUL! The plastic on the sensor can swell from oil and the sensor could break off in the block when you remove it.....that will be the beginning of a bad day then.