run a full bottle of si-1, see the thread in the forum, if it is a clogged injector this might cure it and that's that. It's probably nothing big because the truck runs fine. If you run the fuel trims, you can see how much fuel the pcm is pushing. Check for all air leaks and pull apart air filter assembly and see if anything is a miss. Get a used oil analysis and see if there is fuel in oil, when you send the sample in, make sure the bottle is full. Probably not the sensor if the oem and second ones had it. It could be, but I'd do the ground work and see if the original code was truthful. Replacing the sensor was the smart move, but now you need to make like sherlock and systematically rule stuff out./
OBD II P0174 Fuel System Too Lean (Bank 2) means that the engine control module is adding more fuel than normal to sustain the proper air/fuel mixture due to...
youtu.be