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.
We will need to know which engine it has to answer that.
The 1994 S10 uses a MAP sensor, not a MAF sensor. We need to know size engine you have in that S10.
After the catalytic converter.
That should be the sensor located after the catalytic converter.
4.3L? Inside the distributor.
If it has a 4.3L engine the temp sensor is located next to the thermostat housing.
the fuel level sensor is located in the fuel tank with the fuel pump
The coolant temp sensor on a 2003 Chevy S10 V6 is located on the front of the intake manifold. To replace simply unscrew the old sensor and screw on the new one.
Inside the distributor.
You won't find one. The 1991 Chevy S10 doesn't have a MAF sensor.
Bank 1 sensor 3 would be the O2 sensor after the catalytic converter.
It is located in the fuel tank.