I just got an audi a few weeks ago, it is an 06 with 88,xxx miles it is the awd edition.

Well at first it was leaking oil from the base of the turbo, so I got that fixed. I changed the spark plugs which had never been changed, changed the oil filter which was i think the factory one and put g12 antifreeze since it had the green one when I got it.

Next day the car was running perfect, so i took it for a spin and it wouldn't go over 60 miles an hour , the transmission made the right changes and everything but it felt sluggish. Then the next morning I started it and white smoke started to come out, and the CEL came on. I plugged the computer and this 2 errors came up P0299 (Turbocharger/Supercharger "A" Underboost Condition) and P2097 (Post Catalyst Fuel Trim System Too Rich Bank 1)

Please help, I want to drive this car so bad but I have not been able cuz of this.

 

Anyone please help

 

I would say normally 0299 is a busted diverter valve. Even if it's not the cause, replacing with the latest revision is good idea.

Did you gap the plugs to spec? Is the car in limp mode? Sorry I can't say for sure what's going on there, just throwing ideas out there.

Couple other things to check given the year, there is a recall on the PCV valve, coil packs, and low pressure fuel sensor. Have your local dealer run your VIN to see if any were done.
And also given the mileage, you should check/replace cam follower. If that's worn through then it's damaging your fuel pump and cam. If that's the case, those three are covered under an extended warranty to 120k I believe.

Hopefully this will help you get to the bottom of what's going on. Good luck man.