uggh, this whole "fan noise" has really opened a can of worms...

i took it up to advance auto parts to have a scan done because of my check engine light.

turns out, the error was that my camshaft timing is over-advanced. great. (i guess i should ad that i filled up my tank with mid grade (89) gas last week -- a recommendation made by my dad to save a few dollars) after searching for seriously, two hours on other audi forums, apparently this is the reason for my check engine light. however, what worries me know is the knocking noise my car is making when i start it up. yesterday, the noise was only when the car started... now as i drive it more and more, the noise because more and more apparent. i filled it up with premium (93) just now... and i'm going to reset the computer in my car.

do you think the knocking will subside on its own, after the car re-adjusts to the high octane level? or should i really take it into the dealership?

any help is appreciated, thanks:)