Specifically, I need to know which is the signal wire for the pre and post o2 sensors. Thanks!
SOURCE: location of a o2 sensor 2001 nissan maxima
bank 1 refers to the side of the engine that #1 cylinder is on , and sensor 2 refers to downstream , after the catalytic converter. , this link shows bank 1 on a 2001 nissan maxima V6 being on the firewall side . if you had a 4 cylinder it would be downstream after the catalytic converter .
http://www.autozone.com/N,26200242/shopping/specsSelect.htm
SOURCE: Where is the knock sensor located on a 2003 nissan
It is located on the engine block itself in the valley between the cylinder heads. The entire intake manifold has to come off to access it:
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SOURCE: How do I replace my rear O2 Sensor on my Nissan
In here can find the procedure about O2 sensor replacement: Bosch Universal O2 Sensor Installation Instructions
And here someone images about one typical change O2
Good luck.
SOURCE: I have a 2003 Nissan Sentra SE-R Spec V. o2 sensor location?!?1
theres always one on the intake manifold working its way down to catalytic convertor is the oxygen sensor 1 heater circuit(pre cat conv) signal while terminal #25 is oxygen sensor 2 heater circuit (post cat conv)
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