How to Fix P0171 & P0174 Lean Codes? Find the Leak Fast with a Smoke Machine # #automobile #mechanic
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Getting P0171 or P0174 codes? Your engine is running lean — too much air, not enough fuel. Before you start throwing parts at it, find the actual source. In this video, we break down what those lean codes really mean and why unmetered air sneaking in behind the mass airflow sensor is the most common cause. The oxygen sensors pick up the imbalance, but the real fix starts with finding where that extra air is getting in. Using the AutoLine Pro HyperSmoke smoke machine, we connect to the battery, a
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