What is this and why did it break?

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Crank case hose not to important just involved in emissions

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You’re asking all the right questions.

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And the answer is simple.

If it broke and is now moving when it shouldn’t duct tape, if it broke and is not moving when it should, WD40.

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like seriously,
what does that even mean???

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Possibly someone at the oil change place checked or changed your air filter without unplugging it first.

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You can get the tube from your local parts store. Dorman makes it, and mine broke too. I think it costs around $100.