P0171 Engine Code Explained | Why Your Engine Runs Lean & How to Fix It #obd2

Got code P0171? It means your engine is running lean on Bank 1 — too much air, not enough fuel. In this video we’ll cover the real reasons behind a lean condition, the symptoms you’ll notice, and the right way to diagnose it with an obd2 scanner. Vacuum leaks, bad MAF sensors, low fuel pressure, or clogged injectors — all of these can trigger P0171. We’ll walk step by step through checks you can do to pinpoint the cause instead of just throwing parts at the problem. 🔧 You’ll learn: • Why P0171 happens • The most common symptoms of a lean engine • How to test with fuel trims, MAF readings, and fuel pressure • Smart fixes that actually solve the problem Perfect for DIY mechanics and anyone who wants to understand what their car is telling them. Хэштеги: #P0171 #EngineRunsLean #CheckEngineLight #OBD2 #CarRepairTips #VacuumLeak #MAFsensor #FuelPressure #OBD2Scanner #DIYMechanic #obd2