Its right by the rear exhaust manifold downpipe. If you follor your fire wall directly down, almost dead center, you will see it. it will be hard to get out, and you also have to buy a special socket.
Bung in the exhaust manifold.
The 1991 Pontiac Grand Prix oxygen sensor is located on the outside of the air filter housing. You will find the sensor on the back side of the air filter housing.
The hazard flasher is for a '91 corsica is located in the convenience center. The turn signal flasher relay is behind the dash panel left of the steering column.
If you have a 2.2 engine ( 4 cyl. ) it is located under the ignition module at the back of the engine . Follow the plug wires to the coils, under the coils is the module under that is the crank sensor.
In front, behind bumper.
On the exhaust manifold where the runners meet.
It just has ( 1 ) oxygen sensor , before the catalytic converter ( upstream )
Cam sensor not used on '91 Tempo. Only introduced in '92 model year.
There is no such thing!!
on the transmission tailshaft housing
in the ecu
in the dash