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The Audi B8, B8.5 and Volkswagens with the 2.0T engine come equipped with an electric bypass valve for the turbocharger system, also known as a turbo diverter valve. When this valve fails, it's easy to diagnose the issue as a much more costly problem. 

Your turbo diverter valve or electric bypass valve is responsible for releasing built-up back pressure behind your turbocharger compressor. If pressure is not released, it acts as a brake effect on the compressor wheel which is known as "turbo lag". Sometimes the problem can go unnoticed. Other times, it makes itself very apparent.



Audi B8 & VW 2.0T Turbo Diverter Valve Replacement Symptoms

There is really only one way that these diverter valves fail, and that is when the diaphragm tears. When this happens, it causes an underboost fault.  The symptoms of a failed diverter valve are similar to that of a failing turbo, so you want to diagnose the problem and start by replacing the valve itself. Some of the symptoms are:

  • Increased turbo lag
  • Fault Code P0299
    • This is a turbo underboost fault. If you're getting this fault code, it could mean that either you're having a turbocharger issue, or an issue with this valve. In your diagnostic process, start by checking this valve. 

There isn't an exact mileage or time frame that this issue occurs. Some people never notice symptoms where as other people have reported needed to replace this three times within 20,000 miles. 

If you decide to tackle this job, it's extremely simple to replace. It is only held on by three allen fasteners and a single connector. It is located underneath the car on the turbocharger housing. 


Audi B8 & Volkswagen 2.0T Models Applicable

This turbo diverter valve fits a variety of Audi and Volkswagen models with the 2.0 engine produced between 2005 and 2012, including:

  • 2005-2013 Audi A4
  • 2005-2012 Audi A4 Quattro
  • 2006-2008 Audi A3
  • 2006-2007 Volkswagen Jetta
  • 2006-2008 Volkswagen Passat
  • 2007-2009 Volkswagen Eos
  • 2008-2009 Audi TT
  • 2009-2010 Audi TT Quattro
  • 2006-2008 Volkswagen GTI
  • 2009-2011 Volkswagen CC
  • 2010-2011 Audi A5
  • 2010-2011 Audi A5 Quattro
  • 2011 Audi Q5
  • 2012 Volkswagen Beetle



Audi B8 & VW 2.0T Turbo Diverter Valve Interactive 3D Parts Diagram

  • Unfortunately, we don't have a 3D parts diagram available at this time. 


Parts Included with Audi B8 & VW 2.0T Turbo Diverter Valve


  • No additional parts are included or necessary with the turbo diverter valve.


Additional Parts Required with Audi B8 & VW 2.0T Turbo Diverter Valve

  • Turbo diverter valve replacement is simple and no other parts are required to purchase. 


Special Tools Required with Audi B8 & VW 2.0T Turbo Diverter Valve

  • There aren't any special tools required. In fact, this job can be done with a single allen socket. 


Additional Parts Recommended with Audi B8 & VW 2.0T Turbo Diverter Valve

  • There aren't any additional parts recommended with this turbo diverter valve. 


Aftermarket Upgrades for Audi B8 & VW 2.0T Turbo Diverter Valve

  • We don't recommend any aftermarket turbo diverter valves at this time. 



It's a good thing that this turbo diverter valve comes with our Lifetime Replacement Guarantee like everything else we sell, as there's a good chance it will need replacement down the road. Drive your car for another 50,000 miles or however long it makes it, and replace it again after using our incredibly simple return procedure. 

In the video below, Aaron Davis, our Audi Catalog Manager, gets up close with this Audi B8 and Volkswagen Turbo Diverter Valve. If you're unsure if this valve will work on your car, you can verify the fitment by going to our homepage and use the vehicle selection tool in the upper left corner. As usual, if you like this Really Quick Product Review, subscribe and check back here for regular releases in the future.

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Written by :
Evan Madore

Writer/Editor at FCP Euro and owner of a daily R53 MINI Cooper, a track-built R53 MINI, and a 1997 Dakar Yellow E36 M3 Sedan. ••• Instagram: @evan.madore

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