Ordered these for my 2007 Boxster as so many people have had success with them on their 2007 Cayman. Essentially the same car with a hardtop instead of a convertible. The sensors work exactly as advertised and exactly as the reviewers say. I had the exact same problem with the store being reluctant to install them because they couldn't read them. The store wanted to order a different set from NAPA and use them in place of the ones I brought. After convincing them they would work they installed them for me and like other reviews said they synced within a mile and they worked great. Total cost for installation and parts is about $180. I love saving money on Porsche tax.