First I have to admit, the sensors work. However, they are of very poor quality. I bought them for my Audi RS7 because I needed them for an extra set of rims and tires that I have. The main problem is that the washers don't fit well and are too soft. This causes shaft sensors to leak no matter how hard you tighten them. Also, one of the sensors is intermittent. I would return them but it's too much of a hassle and my installer will just replace all the shims hoping that fixes the problem. It's not the end of the world as I don't use wheels every day, but if I had to deal with the problem on a daily basis I would return them. Disappointed to say the least.