I have looked around this forum and another, I have the following codes, P150, P1171, P0174 and P1174. I can clear them on my UG and they don't usually reappear until after the vehicle is shut off then re-started. My air box lid is missing one clamp, not sure if that affects anything and she came with a K&N filter (drop in). From what I can find on the interweb, P0174/ 1174 are related to O2 sensors (front) and the P0150/ 1171 tag along with them. Depending on the thread others are replacing purge valves, oil separator valve, the hard hoses at back of engine bay along the fire wall (possible air leaks).

Would anyone recommend a new air box lid that has both clamps and replacing to a paper filter? Change out my oil separator valve? replace both front O2 sensors?



I've never had an issue with her as she runs great.. at 122K now and I want to make sure she lasts another 100K.