Follow the wir from the sensor to the connector
If you are replacing an O2 sensor with a new one, disconnect the electrical plug from the vehicle harness, cut the wires off at the old O2 sensor, slip a 7/8" box wrench over the O2 sensor and remove it by turning it counterclockwise. Install the new O2 sensor using a 7/8" open end wrench, tighten it as you would a spark plug, reconnect the electrical plug into the vehicle harness, done.
Most of the time it is just: remove the connection to the O2 sensor, screw out the old O2 sensor, screw in the NEW O2 sensor, re-make connection to the O2 sensor. Note that some O2 sensors do not have plugs and you have to cut the wire and use crimp connectors to attach the new O2 sensor. If yours has a plug, you're in luck. Note that if the package includes a tube of silicone grease, make certain that you use it to protect the connections from corrosion. One of the hardest problems is taking out the old O^2 sensor. They have been in so long that they sometimes become seized in the port. You might have to resort to penetrating oil, heating torch, or a long bar & muscle to get the sensor out. The new sensor should have a little anti-seize on the threads to prevent getting stuck in the port.
If you are replacing an O2 sensor with a new one there is no need for a special wrench, unplug the electrical connection from the vehicle harness of the bad sensor. Cut the remaining wire harness off of the bad sensor so you can slip a 7/8" box end wrench over the sensor and turn it CCW to remove it. Install the new sensor with an open end 7/8" wrench and tighten it as you would a spark plug (no need to over tighten). Plug the harness back together and your done.
don't know what you mean by upsteam O2 sensor but the first sensor is in the manifold, clearly visible with you open the hood. Resembles a larger spark plug and has a wire coming out of it. You can use a 7/8 inch/22mm hex to remove it. Not sure about removing the wire but it's probably similar to the O2 Sensor on the CAT. You squeeze the pin holding the connection in place and pull out.
Under the hood faceing the motor look to the left rear of motor. You will need a specialty 7/8 wrench curvered to reach it. Remove black cross frame support its the long curved brace from oneside to the other of the car. Remove wiring harness that has the plug to the o2 sensor. Remove plug unscrew o2 sensor,replace and re install.
From Underneath the vehicle locate the sensor and using an open end box wrench lossen and remove the o2 sensor follow the wire up into the engine compartment dissconnect from the connection, plug in the new 02 sensor and carefully fish it through so that you can install it as the old one was removed
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