mitsu part number is 91H2021160
spark plugs are 91H2012860
if this post is in reference to your other post on this same model then i would suggest getting the spark plugs, they are known to trigger the code you asked about in the other posting, replacing the sensor will not fix it, unless you know beyond a doubt it is bad.
Nissan part # for the sensor is: 23731-6J0B