2.0T TSI Diverter Valve (DV) Failure (P2099)
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Diverter Valve (DV) on TSI
The diverter valve or turbo recirculation valve is a crucial part of the turbo system. Its job is to relieve boost in between shifts or when you let of the gas. This part most commonly fails due to tearing of the diaphragm. The original version of this VW and Audi DV used a rubber diaphragm over time this would tear causing a turbo boost leak. There later was a revision to this part changing from a diaphragm style to a composite piston. The piston style DV (often called Rev D) has no part to tear making this a better more reliable part. This part is often referred to as the Rev D valve as when the VW/Audi part number was revised, the new number had a D at the end.
While some TSI engines did come with the newer revision of this diverter valve the earlier models did not. We suspect that starting in 2008 TSI engines up to somewhere in 2010-2011 range, most 2.0T TSI engine were fitted with the original diaphragm style DV. Find the Latest Revision of the 2.0T DV Here
If your DV has gone bad you may experience loss of power, or possibly a fault codes like P0299 (Boost Pressure Regulation: Control Range Not Reached) and P0033 (Turbocharger Bypass Valve Control Circuit: Malfunction / Open Circuit). If you have this fault you should inspect your DV to see if you have the old diaphragm style and if it’s torn.
The DV on the 2.0T TSI engine is located at the bottom of the turbo (picture below taken from the passenger wheel well) and must be accessed from under the vehicle. You can see the part from under the vehicle looking up and the back of the engine. It will have 3 allen bolts mounting it to the turbo. Take a look here for a DIY on How to Replace your 2.0T TSI Diverter Valve
Make sure you have the latest version of this Diverter Valve to be sure that your turbo is providing the boost you need.
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