2007 Ford F-150 Q&A
2007 Ford F-150 Question: code p0172.
The code is for system too rich, bank #1. The first thing to check is the freeze frame data so that you get to see under what conditions the code set, and while doing that look at the fuel trims to see if this is just one bank that has an issue, or if both banks are out of control but only one of them bad enough to generate a code. The testing from there will include all of the basics, which include fuel pressure, the baro pid calculation in scan data, and monitor the engine load calculation to gage if the MAF is reporting correctly, and if the engine is breathing correctly. - cardocIII
Do you understand what answer 1 posted? Also are you equiped to perform a full scan test? - pushrod
system too rich bank 1 could be a vacuum leak but not sure - Lowcountry_shawn
Have had plenty of failed injectors,as in stuck open and dripping or bleeding down when vehicle is turned off thus filling the cylinder with fuel and tripping a rich dtc. A simple way to check is to unbolt the fuel rail,spray the tops of the injectors with wd-40 and wiglle them and raise the fuel rail with the injectors still attached to it and shine a light under the injectors. I've found lots of stuck open injectors on these engines! just a thought. - bmdouble