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My name is ***** ***** I am a professional here at Just Answer. I noticed that your question had not received a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.
Inspect the wiring leading to the oxygen sensors for any issues.If any broken or corroded or damaged wiring is found leading to or at the oxygen sensors this will need to be corrected.I have found this as one of the main causes for this type of fault here.If this was already checked and found o.k. let me know so we can continue.
If more help is needed, use the reply tab to continue our conversation. If no further assistance is needed, kindly rate my service.You can rate at any time and we can continue to work on your question as this will not close out your question.Keep in mind in some cases it can be difficult to fully diagnose or help repair your vehicle without seeing it and I work on delivering the best possible answer from what I see to work with.
The only two sensors I see codes set for are the oxygen sensor bank 1 sensor 1 and the mass air flow sensor.The catalytic converter code can be a fault with the catalytic converter itself needing replaced as this is common to restrict and cause issues or if there are any exhaust leaks or damaged exhaust components needing replaced or repaired.In some cases repairing the oxygen sensor code issue here may resolve the catalytic converter code but I see the code is for bank 2 and the oxygen sensor codes are bank 1 so you may in fact need a new catalytic converter.
The ground control comes from the engine computer for the oxygen sensor as well as the signal wires.The only outside wire for the oxygen sensors is the green wire which feeds voltage to the sensor from the 20 amp fuse 14E in the battery junction box fuse panel.
The mass air flow sensor all wires lead to the engine control module as well with no seperate ground wire.The ground is fed from the engine computer on the purple wire to the mass air flow sensor.The signal wires are the light green and blue wires and the voltage comes in on the tan wire from fuse 10E which is a 15 amp fuse.
I see this as a possible oxygen sensor fault (even though it was replaced it may be faulty again if it failed prematurely) or an issue with the engine computer and a catalytic converter fault.
This is a difficult question for me to answer myself here.
I will open your question up for others here to see if someone else can assist further on this as there may be others here that may have more info on what to check or do with this issue.I hope you can get this resolved with ease.No need to reply to my last post here unless it is a last resort as it will keep your question locked to me and others will not be able to view it.If you feel you want to continue to work with me on this feel free to reply at any time but keep in mind in some cases it can be difficult to fully diagnose or help repair this without seeing your vehicle.
I have opted out so if Billy sees this hopefully he will help on this here or any other Land Rover expert here.
Your welcome.Happy New Years to you as well.