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What is your question?
My car didn't pass the emmission test. My mechanic told me that he needed to replace the vacuum. My car ran fine and none of the car lights were lit up.
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The Mechanic did not say the whole phrase, he may have meant there is a vacuum leak etc, so I need to replace this part to fix that problem. Vacuum is basically a state of lower than atmospheric pressure. When the Pistons in your engine lower them selves in the cylinders, they suck in Air or create a Vacuum.