Code P0171 on your Chevrolet? The error that no one explains to you (and how we solved it without...
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Your scan tool says you have a lean condition — but where's the leak? If you're pulling a P0171 or P0174, you know there's a vacuum leak somewhere on the intake. The hard part is finding exactly where. In this video, we show how pairing your scan tool with the AutoLine Pro HyperSmoke machine takes the guesswork out of vacuum leak diagnosis. The scan tool tells you what the problem is. The HyperSmoke shows you where it is. Just connect it, turn it on, and visually confirm the source of your leak.
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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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