P0171 P0174: Lean codes

So I just setup to take my truck in for maintenance which is 100 miles from me and the Toyota service advisor just called to tell me NOT to drive the truck because Service Connect is reporting lean codes. This is a supercharged Tundra with the 2650 Magnuson.

Question? Is it safe to drive with the P0171 P0174 lean codes? I have no check engine light or anything else going on. Truck drives fine.

 

It’s unlikely there’s a problem and that it’s an old code. The way to get a better idea is to disconnect the battery woth the key on for 15 min.

drive the truck for a few days and see if the light comes back on.

but, when I sell a supercharger I always strongly urge my customers to run an afr gauge and a boost gauge. Both readings are cortical to the survival of your engine.

learning what your boost and afr should be, and constantly seeing what they are when you drive is the difference between needing a new engine or not.

I also recommend having a scanner that can read real time data. You should know your fuel trims, timing values, etc. one example: if you have negative timing, that’s knock retard which indicates a critical problem.

please feel free to call if you’d like further explanations.

Keith 760-877-4234

 

Thanks much Keith and all makes sense. I am just now getting more used to the SC operations. I have the OBD Fusion app, I wonder if there is a PID to monitor fule trims, timing and all these values?