Nissan Repair: 96 nissan 2.4 ltr engine, o2 sensors, engine emissions

Question
where and how many o2 sensors are there on my 96 truck, and do if both need to be replaced?

Answer
Hi Dallas -

You should have 2 sensors. One before the catalytic converter, and one after. First one measures engine emissions and the second tells the ECM if the cat is working sufficiently. Usually they do not need replacing unless there is an engine code.

Hope this helps -
aloha
calvin