what are obd2 codes p1170 &p1173 on 2004 Land Rover Range Rover

help diagnosing obd2 codes

I see neither code as being listed as Range Rover codes that year in my information but generically these codes would refer to a heated O2 sensor issue, perhaps look at a Rover specific website.
Google "Range Rover forum" or try http://www.rangerovers.net/forum/
1 more answer
I would like to know the cost too