Unlocking Engine Code P0171 The Essential Troubleshooting Guide

P0171 means the computer is correcting for a lean condition on bank 1 (the rear bank.) A lean condition can be caused by any number of things. The P0171 code means that the engine is running too lean on bank 1, which is the side of the engine that has cylinders 1-3. This can cause ... 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 ... 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 ... 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 ... 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 ... The OBDII trouble code P0171 - System Too Lean (Bank 1) means that the engine air-fuel mixture is too lean, or there is too much air and too little fuel. The DTC indicates that the oxygen sensor on the first cylinder bank has detected lean engine conditions. This means that there is too much air or not enough ... Code P0171 indicates Bank 1 of the engine has a lean fuel mixture. P0174 indicates Bank 2 of the engine has a lean fuel mixture. The PCV will emit a loud sucking sound when the engine is running on idle. It is relieved by removing the oil dip stick.