Hi everybody, I'm new to the forum trying to diagnose a P0171 code on my (new to me) '01 SR5.
So far, I've solved my P1135 & P0420 codes by replacing both O2 sensors with Denso.
For the unsolved P0171, I tried cleaning my MAF but the code returned. My next task was gonna be to check for a vacuum leak. Not sure if there's any common things I'm missing or could try? Thanks in advance for any input.
i recently bought the truck and the dealer didn't disclose multiple check engine codes so I'm hoping this is an easy fix