p0171 Code how to repair?

Question

nissan GTR35 code P0171 , P0300 ??

Answer 1

This usually indicates an issue with the maf sensor. It really needs to be diagnosed with a scan tool that can watch live data from the sensor, along with the fuel trims.

It's a lean code for bank 1. It can generate the p0300 multiple misfire code because the cylinders on bank 1 are lean in mixture.