1995 V6 has 2 O2 sensors.
1996+ V6 has 4 O2 sensors.
Sensors cost around $60-70 each.
If you search the boards, you will find plenty of posts on this topic.
96 Contour SE
Duratec V6 24-valve 2.5L ATX
108,000 mi.
Replaced: crankshaft w/ DMD, EGR valve (clogged), EVR, DPFE, PCV valve, evap emissions hose & tube (cracked), window regulator (broken), LH & RH PCV tubes, UIM gasket (leak), ignition coil
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