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nerdtalker
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nerdtalker's post in 04 Cayenne TT – High Idle and Brake Booster Failure after replacing co was marked as the answer
Just to update, I fixed it and figured everything out.
Throttle body needed to be re-calibrated which I performed with durametric. For some reason the 60 seconds in on position and 10 seconds of off didn't do it. No matter, it only took a few seconds to run the adaptation over the computer, then the idle came back down.
Brake booster was equally simple. I forgot to plug the vacuum pump back in. Plugged it in, reset codes, brakes are back and the Cayenne runs great now.