check engine light came on about 2 months ago had my mechanic pull the code po175 (bank 2 rich) because it was just bank 2 i decided to go after the 02 sensors. replaced them 2 weeks ago and had the code cleared. was fine until this past Sunday. shut the truck off to get gas and when restarted the light was on again. had the code pulled today and its po175 again. any ideas?? 97 5.4 127xxx mi. stock except for a k&n filter and flo master muffler. i did a search but the 3 posts that popped up dealt with both banks being rich. thanks in advance

 

Check the vacuum hose going to the fuel pressure regulator. This hose has some history of melting shut and restricting vacuum.

 

My 04 F250 5.4 was throwing code PO175. After days of trouble shooting everything I've been reading on the threads. My issue was Bad #8 coil pack. Go figure!