Engine Code P0171 Demystified The Ultimate Fix Guide

a problem with the AF sensor · a small error in estimation at the ECU of when air should be passing the AF sensor from each bank · injectors that ... 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 ... Engine code p0171 = System too Lean (Bank 1) · The MAF (Mass Air Flow) Sensor is dirty or faulty. There is an issue with some Vehicles where the ... When the code says that the fuel system is "too lean," it means that the computer has been adding more and more fuel, which is called Long Term Fuel Trim. Check the engine air intake duct for leaks/tears/holes, especially in the folds. It's a common source of a Murano vacuum leaks... The PCV will emit a loud sucking sound when the engine is running on idle. It is relieved by removing the oil dip stick. For example, code P0170 could mean the right cyl. bank could be running either lean or rich and the same for code P0173. They want you to read ... Engine Fault Code P0171 - System Too Lean Bank 1! [Symptoms, Causes, and Fixes] · Comments133. code issue is lean condition bank 1 I replaced PCV valve and hose. I cleaned MAP sensor. I installed a hose clamp on passenger side vacuum ... The P0171 trouble code indicates that your vehicle's engine runs too lean on bank 1. This means the air-fuel mixture contains too much air and not enough fuel.