I found that the fault in the O2 sensor was the fault of the mechanic that did the clutch work. He left the wire for the downstream sensor on bank 1 resting on the tube that goes to the EGR valve. Melted about 3 inches of the insulation on all four wires. I repaired the wires, replaced all 4 o2 sensors, new motorcraft plugs (fine wire) and the codes are gone. Runs like a r_ped ape. Also I found that instead of going at the upstream sensor from the top that it is easier from the bottom. I removed part of the trans. mount and it allowed me to reach the sensor with a min. of trouble. I tried to get it from the top for about 1/2 hour. Used a crows foot O2 socket/wrench and it worked like a charm. Just having a brew to celebrate.
