Just got this code over the weekend. I've searched this forum and nobody else seems to have ever got it. Oh well from the looks of things it seems to be a bad HO2S on the right side. Has anyone replaced an o2 sensor themselves? Sounds like an ineresting /First DIY job on my new baby!
The full error from a forum post.
P1173 Downstream fuel trim malfunction (bank 2) Front sensor aged - rear HO2S adaption too lean/too rich RH bank (NAS and EU-3 only)
http://www.canobd2.com describes the error as:
P1173 - Land Rover - Lambda sensor aging tv bank 2\nDrive cycle C:Signal out of range - above maximum.\n