Master the Enigma of Engine Code P0171 A Troubleshooting Blueprint

My 2005 mustang GT's check engine light came on yesterday. The 2 codes were P0171 and P0174 which are lean codes for bank 1 and 2 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 ... Code P0171 stands for “System Too Lean (Bank 1)”. This diagnostic trouble code can happen for a number of reasons related to combustion inside your engine. The ... 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 ... The P0171 code means your engine is running lean, with too much air and not enough fuel. Common causes include vacuum leaks, ... The reading is too lean (i.e. too much air or not enough fuel). P0171 is a bank one reading lean, P0172 is for bank two reading lean. If the PCM is saying is ... Recently I was driving my car home from a 2hr road trip when my "Check Engine" Light came on. The code that popped up said that my system was ... Chevy / GM P0171 or P0174 System To Lean Bank 1 Bank 2 · Check Engine Light? · Engine Fault Code P0171 - System Too Lean Bank 1! · P0171 Trouble ... After doing some Google searches, I found that code means air fuel ratio is too lean. So the measured af ratio has less fuel/more air than what ... P0171 and 174 are related to the injectors on Banks 1 & 2 reporting a lean condition, meaning they aren't supplying enough fuel. A faulty MAF ...