On a 2012 A4 S-line 2.0 75,000 miles.... I have a P0299 engine code which is a turbo diverter valve code. Here is my dilemma.......the original valve was the upgraded D version. The OEM valve had zero signs of wear and looked brand new. I replaced this valve anyway with a new one.(same upgraded D version) I do NOT have any power loss or any noises to indicate any leakage from a faulty valve. I unplugged the battery in hopes to reset the light to no avail. I have also checked for any loose connections to which there are none. This light and code has been on for a couple weeks.....What else could this code indicate??