Hello everyone! I have a quick question, and yes I searched and didn't find what I wanted to know.
I need a diagram or something showing the O2 sensors location on my 2014 IS 250, specifically banks and sensor numbers.
Thank you in advance.

 

Here is the location of the sensors, and which Bank is which. You won't find part numbers in the diagrams, as the part numbers will vary depending if you have RWD or AWD. The diagram below is for RWD.

 

Thank you for the image and I'm sorry I didn't mention my IS is a AWD, I believe I saw some o2 sensors by the manifold.

 

The sensors by the manifold (before the Cat's) are the Air Fuel (A/F) Ratio sensors. Visually they look identical to the Oxygen Sensors.
The part number for the A/F sensors start with 89467. To get the last 5 digits of the part number will take a little searching.

 

I'm getting a code P015c, for bank 2 sensor 1.
I have done lots of work on Hondas and BMWs and this is my first Lexus.