O2 sensor locations

I have a 1997 Blazer, 4.3 Vortac. Have Codes P0147 , P0155 O2 heater problems. My Scanner gives me referance pages G096 and G122 for locations of O2 sensors any one have thease pages. I have looked all over and cant come up with them. O2 sensor Bank 1 sensor 3 And Bank 2 sensor 1 is what I am looking for. Thanks

Bank 1 Sensor 3 is the one right behind the catalytic converter. Bank 2 Sensor 1 is passenger side just behind the manifold, and Bank 1 Sensor 1 is drivers side right behind manifold on your Blazer.

A good way to remember where they are is bank 1 is always the side where cyl 1 is located and bank 2 is the other side. and anything sensor 2 or higher is behind the catalytic converter which monitors how well the converter is working. Where sensors 1 monitor the engine.

Thanks Jeremy I will be checking out the wireing today and update what I find.:smokin: