Posted by Adam in NYC on January 04, 2005 at 20:38:02:

In Reply to: Which O2 sensor to change with the followin codes posted by Pietro on December 29, 2004 at 10:57:27:

Found this by Google "land rover Discovery obd fault codes"

Reference this:

http://www.robisonservice.com/servicedep/rover_obd2.asp

P0135 Heater Circuit Broke. O2 sensor at exhaust manifold Pre-Catalyst Converter -next to engine.
P0150 After Catalyst-

Time to get the manual. Check the wiring first before changing the o2 sensor. If you are on a budget, try www.carcannibal.com in Nashville. They have used working O2 sensors for $75 a pop. You HAVE to give the year to get the right one.

Adam