I just replaced all 4 O2 sensors on my 03 Disco, I cleared those codes and now about 50 miles later the following codes have come up, 1590, 1415, 1174, and 1171. Would anyone know what would trip these? Is it my MAF? Thanks for you help. The Disco has 67,300 miles on it.

 

1171 indicates oxyger sensors too lean on both banks, I can't find the other 2 codes.
What are you using for an air filter, what octane gas?
Without the other 2 codes, I wouldn't say a MAF.

 

I dont know what air filter is in there, I just bought it a couple of months ago. I always run 93 octane gas.

 

Up until I bought it a couple months ago it was taken to the Land Rover dealer for service, right before I bought it it was in for the 60k service so I would assume they would use the correct air filter but who knows.

 

Never, ever assume anything in this world.

 

I just checked the air filter, there were no markings or anything to tell me what kind it was, it was clean. What air filter should I have in there?

 

Just make sure you don't have a K&N, oil covered air filter, they are real hard on our engines.
As long as you have a clean paper filter you should be fine.