Syptoms I have is werid shifting sometimes, goes away when u turn it off and on again.
and the MIL light that says P1173

Downstream fuel trim malfunction (bank 2)
Front sensor aged - rear HO2S adaption too lean/too rich RH bank (NAS and EU-3 only)

so what does that mean?

O2 sensors replaced twice, all 4.
cleaned the maf sensor
dont know what else to do
now it is shifting crazy


2003 range rover
code came on at 60k now it is at 70k


any suggestions

 

You may wanna try checking your PCV hoses found out a lot about this on another forum. You would have to take off the acoustic Land Rover cover and the hoses run horizontally in the back of the engine bay directly below the acoustic cover bracket. Depending on your year they may be wrapped in some sort of cover. A lot of people have reported those hoses melting and causing codes.

 

Did you ever get your P1173 code fixed?