Uncover the Secrets of Engine Code P0171 A Comprehensive Guide

P0171 is a lean code caused by a vacuum leak, mass airflow failure, faulty PCV valve, or low fuel pressure. I would start by checking all of the ... A trouble code P0171 or P0174 means the oxygen sensor or Air-Fuel Ratio (AFR) sensor (in bank 1 [P0171] or bank 2 [P0174]) has detected a lean ... The answer appears to be: If it is not a vacuum leak then the MAF - Mass Air Flow Sensor or A/F Air/Fuel Sensor if there is a P1135 error code also! Most everyone said the O2 sensors seldom are the reason for the code. Most all said look for a vacuum leak. The last thing I did was to replace ... The check engine code was P0171, a lean fuel trim. He cleared the code and checked for air leaks and said the car needed a new PCV valve and he installed one. 2nd Generation (GE 08-13) - Engine light P0171 - Error code P0171 refers to lean Air/Fuel mixture in Bank-1. The cause of the problem can be ... Autozone told me it was a P0171 code which means the fuel system is too lean....possibly due to a MAF sensor, Oxygen Sensor, intake leak, or any ... Engine Fault Code P0171 - System Too Lean Bank 1! [Symptoms, Causes, and Fixes] · Comments133. More often than not P0100, P0110 and P0171 are related to the MAF being dirty or worst case damaged. Normally you start with the lower codes ... When I Googled it, it basically said the car is either getting too much air or too little fuel and the culprit could be a number of different ...