there are 4 on the car 2 in front of the cats 2 behind the cats on the exhaust pipes
You have several O2 sensors on that vehicle and they are all threaded into the exhaust system at various points.
2
The '97 is OBDII. There are 4 different O2 sensors on the '97 Cadillac. http://www.airbagcrash.com
i believe there are 2
The O2 sensor on any vechicle will be located on the exhaust manifold.
All O2 sensors are located in the exhaust system at various points.
Pre or Post?
YES
you have 3 on the astro & safari vans 4.3L
I have a '95 E150 and a '96 E250, both are 4.9 straight 6 cyl. One has 1 O2 sensor and the other has 2, one on each half of the exhayst manifold. I believe the 96 has 2. but it is an E250, not sure about the '96 E150.
one at the front of the cat and one after the cat
Two, one on each side of the catalytic converter