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No, read the writeup and it should explain a lot. The air tank is needed because you have to be able to hear any hissing air leaks. If the engine is running or there is a scream air compressor, you won't be able to hear it.

Even minor leaks can cause a problem. This method will also let you hear it if it's under your car so you don't have to crawl underneath. But if that's where the leak is, then obviously you will have to get access to it. It's probably a split hose or a clamp came off.

First check for this and check for any error codes at your local parts store.
 

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