Land Rover Repair: Freelander Fault Code, mixture problems, fuel mixture

Question
My wife freelander's check engine light is on.  Our   friend, who owns a garage, read the codes for us.  There are three codes P171, P174, and P1473.  He told me that the first two related to the oxygen sensor.  He cannot find the last code from his list. Could you tell me what is the meaning of the last code?  Does all three are related to a specific problem?

Thanks for your help.

Answer
P1473 means the variable valves in your plastic intake manifold are stuck shut.  LR has a kit to fix this problem - see your dealer.

171 and 174 are fuel mixture problems, at lean limit, left and right sides.  Further testing would be needed to figure the cause of that.