What did you do to your LR3 today?
#1121
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O2 sensors generally are replaced between 75k-100k. Modern ones do last longer, so 100k is very doable. But I would not want to push them past 120k. Walker Brand upstream are re-packaged Denso for a lot less. Downstream do not have to be replaced until they go bad, they dont affect fuel economy. They just monitor the cats to make sure they are working.
#1122
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Apparently at 155,000 miles they are starting to misbehave, so will be replacing the upstream ones, hopefully the catalytic converters are still OK... I don't seem to have any mpg or performance problems, but then again I've never owned a working Land Rover LR3 until now...
#1128
#1129