Step one, find a new shop, step two, find a new dealer.

The PCV may need to be done, but has nothing to do with the TPMS or the stability control if those are the codes you are getting. And they probably just want to play parts darts and get you to spend some money for crap that won't address your problem. Who knows maybe I'm way off, but the 3.0T has a ton of PCV issues out there and zero of them cause what you are describing. PCV is usually a rougher idle, coolant loss, excessive oil consumption, excessive crankcase vacuum.

Also, a timing chain cover leak causing a TPMS or stability control problem? Other than oil leak, it won't do any of those things. That's just silly.

Can you post the actual codes here?

Do you have any issues or codes with the ABS? My first thought would be something like a wheel speed sensor. The TPMS has nothing to do with stability control, other than Audi uses the wheel speed sensors to determine if a tire is underinflated by comparing the rotational speed of each wheel, it does not use this information for anything else, just that the sensor is shared.

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