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Originally posted by ramon1809:
I suppoused it was from bank 2, I just have the doubt of where in the car is the bank 2,
I know that there are 4 sensors, and I do not want to replace one that is working fine...
The following is from http://www.contour.org/forums/ultimatebb.php?ubb=get_topic;f=3;t=006069

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Last but not least, it is worth noting there are actually four sensors: upstream and downstream for each of the two cylinder banks. They are called HO2Sxy, where x indicated the cylinder bank number (bank 1 is closer to the firewall), and y indicates upstream (1) or downstream (2). HO2S11 seems to be the most frequently-mentioned of them all (I replaced mine last year; there's a wealth of info available via Search).
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Additionally, Are the three sensor the same?, If I bought it I just buy an oxygen sensor for contour 98 duratec? or do I have to specify which one?
I believe that the front two sensors are a little different than the back two.

I got the following from http://www.contour.org/cgi-ubb/ultimatebb.cgi?ubb=get_topic&f=3&t=008139&p=

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To make sure you've got the right O2 sensor before you leave the store, the lower one's have a round connector and the upper is a sqaure connector.
You can go to http://www.boschusa.com/AutoParts/PartFinder/PartFinder.asp for info on Bosch oxygen sensors.

1996 Contour SE Sedan 4D (Royal Blue)
Duratec V6 2.5L 24-valve DOHC
Automatic
75,000 miles
No Mods (unless you call the DMD a mod)
Replaced EGR valve (gunked up), EVR (EGR VR), PCV valve, and evaporative emissions hose (cracked).