It suggests that your pre-cat O2 sensors are old...but...if you clear all codes and let your Disco warm up at idle for ~~30 minutes and *then* run your diagnostics, numbers that close might turn up "acceptable".

 

Cool, thanks. I will put them on my list to replace in the near future. I did this test just after parking and had driven for about 20 minutes in 95 degree heat.

The good news on that front is my coolant temp, the original reason for getting this scanner, is staying below 200 after installing the 180 thermostat and fixing my coolant leaks. I've bled the system 3 times now and *almost* have no waterfall sound left, maybe 4th time will be the charm.

 

go with walker o2 sensors if you need them. Best ones for our rovers

 

Those are great O2 sensors (especially for gas mileage), but if your goal is to not have code failures the cheapo knockoff O2 work: Brand New O2 02 Oxygen Sensor Upstream Front Pre-Cat for Land Rover SG338