just got my 2005 XJ8 out of the shop for the third time trying to get this issue fixed. The started by replacing the throttle body. The error came back on a week later. The second time the replaced the plastic hose going to the throttle body. The error came back on a day latter. Just got it back from the shop after 3 days. This time they replaced the oil filler tube o ring. The error came back on on my way home from work. Starting to question if they know what they are doing. Go there because it’s the shop the Jag dealer recommended. When’s by O’Rileys had them scan the car the code they got was P0171 bank one lean. Anyone have a clue what the problem might be. Thanks in advance

3labsdaddy
2005 XJ8