I currently have P0172 Bank 1 rich. I cleaned the sensors and it returned within 1 mile of driving.
I have ordered 2 PCV valves because a stuck open valve will allow more unburnt gases than normal and richen the right side.
If that does not fix then I will move the sensor to the other side...
I have had the same issue with a 2011 LR4 and had the rotors turned due to hard spots in the disk. The problem disappeared for about 7000 miles but returned. I replaced the disk with a Wagner brand and the problem has not return. I examined old disk and it appears the OE disk had imperfection...
I had the same issue with a 2011 LR4 and I replaced the lens. Problem solved, but use the windshield urethane by JLR and prime the plastic. I used incorrect type and the lens pulled away from body due to heat warping plastic. I had to carefully remove lens and clean up surfaces for new JLR...
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