On a 1989 Oldsmobile 88, the oxygen sensor is typically located in the exhaust system, specifically on the exhaust manifold or the exhaust pipe just downstream from the manifold. It is often found near the front of the vehicle, close to the engine. If you're having trouble locating it, consult the vehicle's service manual for specific details related to your model.
a low oil sensor
18 Gallons.
In the fuel tank.
you gotta take the dash off to get to them :)
check the computer module UNDER the coil.
its built into the bottom of the coolant reserve tank
Remove it carefully, spray the sensor wire with brake clean or alcohol, do not touch it, reinstall.
on a 1994 it's behind the harmonic balancer
under the dash on the drivers area.
under the throttle body next to the thermosat housing.
in the intake where the dist. should be on the front of the engine
GM vehicles do not have an inertia fuel cut off switch.