There is more than one O2 sensor depending on which engine you have. They are all threaded into the exhaust system at various points.
We will need to know which engine it has to answer that.
On a 1998 Chevy S10, the oxygen (O2) sensor is typically located in the exhaust system. There are usually two sensors: one is positioned in the exhaust manifold or just downstream of it (upstream O2 sensor), while the other is located further down the exhaust pipe, before the catalytic converter (downstream O2 sensor). To access them, you may need to raise the vehicle and safely support it, as they are mounted on the exhaust components.
Bank 1 sensor 3 would be the O2 sensor after the catalytic converter.
it should be located on the front exaust pipe before the cat converter.
There are several O2 sensors on that vehicle and they are all threaded into the exhaust at various points.
The 1994 S10 uses a MAP sensor, not a MAF sensor. We need to know size engine you have in that S10.
They are all threaded into the exhaust system at various points.
It doesn't have an O2 sensor in the intake manifold. O2 sensors are located in the exhaust system at various points.
The idle sensor on a 1991 S10 4.3 can be located at the engine bay.
A 1998 Chevy S10 Blazer has a total of two oxygen sensors. One is used for the upstream and one for the downstream.
All O2 sensors are threaded into the exhaust system at various points.
There are several on that vehicle. They are all threaded into the exhaust system at various points.