I am going only on what I've been told. But it sounds as if it is just an orientation thing. First, you have to let the thing know that your the boss. But at the same time, treat it to an apple or some special oats. (They like both and it may win points for you as an ally instead of just someone who jumps in the saddle.......
Wait, scratch that, you have a truck not a horse.
P0172 identifies as "SYSTEM TOO RICH (RIGHT CYLINDER BANK)"
Now I have absolutely no idea what all that techno-speak means but if you intend to keep the hors....uh truck, I'd certainly check the easy fixes - air filter, fuel filter etc.
Sorry Im no more help than this but maybe it gets you started. Keep us posted.