Need help 93 Olds 3800 crank sensor fails 3 times in 12 months

May be bad harmonic balancer ,that may be why you have to have it replaced so often,the magnet is weak,i would look there,and replace it.It,s happen to me before,life experiance,,good luck with it

Thanks folks for the quick response. So far I haven't heard from the repair shop of any scuffing marks or damage to the failed sensors at this point. If memory serves me (and it may not LOL) this is an interrupt type in a fixed position and contains no magnet. They did note there was some oil leaking in the area but didn't seem to think it contributed to the failures. I do remember a magnet on the cam gear on these the used to fall off or something, but the replacement of the crank sensor makes it from no start....to reliable (At least for a couple of weeks), so I have somewhat ruled that out. I did go ahead and order a new aftermarket balancer since it seems like the next logical progression imho.

I had the same problem with my 93 Olds 88. Turns out the the wiring harness for the crank sensor runs behind the water pump area. The insulation on the wires deteriorated allowing the wires to make contact shutting of the motor and throwing a crank sensor code..

Had this problem melted wires behind water pump took week figure this out seen your post trying find out what else it hurt since car still wont start changed crank sensor