I have a 2002 Toyota Corolla (1ZZ-FE engine) and I am trying to understand the fuel trim values I am getting in real driving conditions from my scan tool. I have P0171 code (lean condition) that comes on and off. I posted earlier about this, but I fixed a lot of things in the meantime. I was hoping someone could take a look at the screenshot attached and tell me if these values look off or not.
- STFT mostly remain between -5% - 5% which I think is great.
- LTFT, however, ranges from 12 to 25% These values look high to me, is that right?
I appreciate any insights!