O2 sensors?????????

[tps2000]

Anybody out there tell me how many o2 sensors are on my 2000 Maxima. I have looked and I cant tell how many I need to buy. Also I have found some 02 sensors online and they have wire connectors on them instead of a weathertite connector, are these sensors ok or do I need to stay away from these things? I just had my iacv replaced and the car runs better but it smells kind of bad out the exhaust and I think it is from the 02 sensors. The car is 7 years old and has 152000 miles. Thanks 4 assistance.

[nissanmax51]

there are three o2 sensors, 2 upstream,one downstream. the downstream is the one that has the weathertight on it. I would just stick with the OEM o2 sensors. i would think the o2 sensors would cause the smell of exhaust but i'm not sure.