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You need a scanner to see the function of each of the sensors and findout which is the one you need to change. nissan sentra has 2 upstream sensors and 2 downstream sensors. some scaners identify the sensors with a letter A OR B
There are two O2
sensors in 04 Nissan Sentra. One is located in engine compartment in Exhaust
manifold while other is located at bottom of car behind catalytic convertor.
if this is a automatic trany then the switch is part of the nuetrul safty switch, this is locate at the base of the shirter. if its stanard shift then its located on the side of the trany, its on the right side of the trany, , hope this helps.
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