P0171
The code P0171 (https://www.yourmechanic.com/article/p0171-obd-ii-trouble-code-system-too-lean-bank-1-by-andrew-quinn) is due to the left bank of the engine running lean and has reached the rich limit for the ECM. Try to have the injectors cleaned (https://www.yourmechanic.com/article/how-to-use-a-fuel-injection-cleaning-kit-by-ed-ruelas) and run only high quality fuel that has cleaning...