Today at Deutsche Auto Parts we are going to be talking about the difference between a diaphragm and piston style diverter valves on 2.0T engines Fault Codes Possibly Related to DV P0299- Boost Pressure Regulation: Control Range Not Reached Here we have 2 diverter valves DVs for 2.0T engines. This was the original style, diaphragm style diverter valve and here is the updated piston style. The reason why this was replaced was because they had leaking issues. This would cause under boost faults and different other turbo related faults. And the main difference of what you are going to find is this particular diaphragm would tear along the edges here from opening and closing. So they replaced it with a piston style that doesnt have any moving parts that can tear.So that has been an upgrade. They are both made by the same company, Petersburg. This Petersburg version will be the identical version as what you would find from a VW dealer minus the VW logos on there. SO it would actually have the same exact Petersburg part number listed on it as this one. That would be the only key difference. The DV on the 2.0T FSI and TSI Engine is located here. It is mounted on the bottom side of the Turbo and Must be accessed from under the vehicle. Looking from Passenger Wheel well Thanks for watching, be sure to subscribe and leave any questions, ideas, or feedback in the comments below. .