Hi Mr PC,
I have a 95 Contour V-6, and I replaced both my O2 sensors. It puzzles me because the one that Philip had so much trouble with was EASY on my car (no need to removed filter or any hoses). My car is fully loaded accessory wise. Maybe they did some changes for the 98 model? Took 10 minutes tops.
ON THE OTHER HAND, the sensor nearest the cabin/firewall was ABSOLUTLEY GAWD AWEFUL. Would rather replace oil pan gasket again that that #@%!^!@# sensor. I believe this is the bank 1 sensor. I coulnt get to it under the car, and there is some big black thingy which severely obstructs the topside access. Philip is right - just keep a cussin and you will EVENTUALLY get it.
Good Luck
Jab
