NO. there 2 different things / sensors.
As far as I know they can not be cleaned. Must be replaced.
If the oxygen sensors for the 1991 Chevy 4.3 is running rich when it is warmed up it is best to have the sensors replaced. Once the sensors are replaced this should resolve the issue.
They are replaced when they go bad.
If you have a 2.3 or a 2.6 motor, there should just be one oxygen sensor. It will be located on the exhaust manifold. On the driver's side of the motor you should see it down by the firewall. It will have a single wire coming from it.
The oxygen sensors that connect to the exhaust system. There should be two, and they should screw into the side of the exhaust.
Oxygen sensors are located in the exhaust manifolds & in front pipes, should have 4
Should be 4.
Oxygen bags? Are we talking air bags or oxygen sensors?
It should have 4 of them.
Follow the exhaust back, in the exhaust there should be spark plug looking sensors with a smaller single wire coming out the top, these are your oxygen sensors. Depending on year there can be one to four sensors on your auto.
Should be two front and rear of engine