I have the same vehicle
Start with basics.
Connect a vacuum gauge as per old school and analyse first to confirm mechanical integrity.
Now inspect for vacuum or exhaust leaks(check the flex joints in the extractor)
Are you losing coolant? Have a look at the top of number 6 piston - is is it steam cleaned?
Look at the short and long term fuel trims - is there a lean command or rich command in the feedback loop.
List the reasons that your fuel trims might be as they are.
Work through those reasons methodically.
Include a thorough inspection all wiring for chaffing or high resistance points on that bank - hands and feel.
Now check ignition - as best you can. Spark tester is useful or for ultimate tool to find someone with oscilloscope to check kV, burn times coil ramping curves, coil switching inputs etc etc
Only now look at input and output sensors such as O2 integrity - and use evidence only to nut it out.
Try not to succumb to being a sensor changer - it will cost much more.
1998 D1 in showroom condition, 1999 D2 TD5 with everything, 2000 P38 showroom condition.
Freelander 2 2012
1992 RRC sold and now pranged.
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