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My check engine light has been on for a few months and I finally was able to get it read. The code came up PO158 which is coming up as O2 sensor 2 in bank 2.

Does anyone know which of the 4 this is?
 

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I did a quick search for you and came up with this advice:
"PO158 = Passenger side back sensor. Before I would change the sensor make sure that there is no damage to the wires. Sometimes road debris can damage a wire and that will throw the code. If you have the time and you like to tinker you can switch the passenger side sensor to the drivers side and see if the code goes from one side to the other. This will determine if it's the sensor itself or the wire. It is alot cheaper to diagnose with parts you already own. Get a 22 millimeter wrench and O2 sensor socket to make the job easier."
 

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Yes I'm sure! I've been with Nissan almost 10 years and we are always changing O2s on these R50s...good luck!

Besides, who you gonna believe, a Nissan Tech or some guys that toy around with their Nissans on the weekend...food for thought!
i also work with nissan as a parts guy and i see it in my parts data base as the same way
 
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