I just changed mine and it was not too hard at all. I got that same code and from what i can tell so far it was just a bad o2 sensor.

1998.5 SVT Contour silver frost Intake, Exhaust, 20% mirror all around, 18" ALT stanima wheels, Eibach's, B&M short throw, 9mm ford racing wires, SAFC II, oem carbonfiber hood, MSDS headers, Panasonic head unit and one alpine 10".