The Zetec only has one bank. There is no Bank Two.

Sensor # 1 is the one closest to the engine, before (upstream of) the catalytic converter.

Sensor #2 is after the converter (downstream).

Steve

98 Contour SE Sport 2.5 Duratec ATX The wifey's car 89 Taurus SHO - 246K miles 94 SHO ATX - 190K 1997 F-150 5.4L ATX - The Workhorse 150K. ANY THREAD WITH "OMG" or "WTF" ETC IN THE TITLE WILL BE IGNORED!