Any body have to change this sensor. Any how to's on replacement. I would like to do it my self and avoid the shop of possible.
Well, if NOx and O2 sensors are the same (which, I think I have found info saying they are...?), then it could be a bit of a challenge. Look at page 12 on the attached link: https://static.nhtsa.gov/odi/tsbs/2015/MC-10126380-9999.pdf
It talks about he NOx sensor locations. Sensor 1 is at the Turbocharger and 2 is just past the SCR (CAT) on the exhaust. Based on the research I did, since we have an I4 engine, we should only have a Bank 1 (no Bank 2) and 2 sensors to go with it. Sensor 1 is going to be before the SCR (CAT) and 2 is after. So, since yours is Sensor 2, it should be the second sensor.
Based on the diagram, and from looking back at the pictures from the Exhuast Removal Guide, it should be the sensor that is attached to the wire of the 2nd item circled in yellow. It's the bigger of the two sensors there shown.