It does sound like eht pump and all is working properly, and you have no warning messages yet which is also a plus. I'd jack up that back corner and pull the wheel off, then soak down the bag with a spray bottle with a soapy water mix and look for the white froth/bubbles on the bag. Dish soap works good for that.

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X5 pics

RIP 4.6is.....

2003 4.6is