I live in Sebastopol and recently purchased a VW TDI. When the check engine light came on, I called and reserved a appointment at K Tech for diagnostic and repair. They did a great job identifying the problem and fixing it. At all times, I felt that they were being honest about the best service for the car. While the repair did take longer than expected, it was due mostly to how thoroughly they investigated the problem. I have driven the car for over 300 miles now, and the light hasn't come back on! I also got great advice about how to smog the car effectively, and about future service that would make the car run more efficiently and with more power. I definitely plan on taking my car back to K Tech.