Thse codes are picking on fuel trim behind the cats. It's a really fucked up code to chase sometimes. Your going to want to see the fuel trim readings at all the blocks or load ranges. At the bottom lft will be closed throttle no load and the upper right corner is wide open throttle full load. Most times fuel trim issues on LR3's get fixed with injector cleaning, or a vac. leak. Easiest thing to do would be put some 44K in your tank when you fill it and monitor your fuel trim. Don't sub some other shitty panther piss fuel injector cleaner, get the 44K.
Think about air filters and mass air flow meters too. I just remembered a car I worked on that had some after market vents in the fenders. The one on the right fender is a functional air inlet to the air cleaner box. I think I actually had a Mass air fault code with that one.