I highly recommend zahntech. They have amazing service and lots of knowledge. I have a 2009 TDI and they save me thousands of dollars. My check light came on and University of VW scan to see what was wrong and code came up P0401. Which was EGR filter, DPF filter, and the catalytic converter total cost $5,500. Always good to have second opinion when cost is that much. Called around and many people recommend Zahntech and I'm so glad. I only had to pay $145 wow and my engine light hasn't came back on. Thank you Zahntech.