Good Day, Thought I would try some MX 2-1 sensors, bought a box of 20. Installed several sets easy to program and install. First customer returned after several days, when the car sets for several hours the display on his dash reads 0 pressure on several wheels. Tires pressures are fine, drive a few hundred feet and the correct pressure shows up on the dash. Bad sensors or just cheap get what you pay for? Really don't want to install more if we are going to continue to have this problem.