09-10-2024, 09:44 PM
Hey all, my 2009 Ford F150 has been throwing the P1131 code for a while now. From what I understand, it’s got something to do with the oxygen sensor reading too lean on bank 1. I’ve already checked for vacuum leaks, but I didn’t find anything. Should I go ahead and replace the O2 sensor, or could it be something else? The truck’s been running a bit rough, and the fuel mileage isn’t great. Any advice is appreciated!