I got the following fault codes read on my 2003 Discovery:
P0174
P0150
P1174
P0159

The truck has 72K on it, and got the service engine soon light on at its 69K, and ever since found lacking of power and excessive gas consumption.

Can someone help me on getting what the descriptions of these codes and what I should do to get them corrected?

Many thanks!

 

im am pretty sure that you will need a new MAF from the P0174 and P1174. Although there shoudl be a P1171 as well

 

You don't need a MAF, you don't have the needed codes to verify it is failing.