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.
Bank 1 sensor 3 would be the O2 sensor after the catalytic converter.
There are several O2 sensors on that vehicle and they are all threaded into the exhaust at various points.
it should be located on the front exaust pipe before the cat converter.
They are all threaded into the exhaust system 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.
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.
There are several on that vehicle. They are all threaded into the exhaust system at various points.
There are several O2 sensors on that vehicle and they are all threaded into the exhaust system at various points.
All O2 sensors are threaded into the exhaust system at various points.