How do I fix the code P0171 on my Chevy?
You can usually fix P0171 using the following steps:
Replace the fuel pump or fuel filter.
Change the fuel pressure regulator.
Replace the powertrain control module.
Change one or more injectors.
Replace one or more oxygen sensors.
Change the mass airflow sensor.
Repair vacuum leak.
What is the most common cause of P0171?
The most common cause of the P0171 code - and the P0170 and P0173-P0174 codes - is unmetered air entering the combustion system. Most of the time, this happens due to faulty or dirty mass airflow sensors or weak fuel pumps.
5 сен 2024
