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Why does smart not use the ABS sensors to figure out if a tire inflation problem exists? We had a situation with our Mazda CX-5 where one tire was at 28 psi and the others were at 32 psi. The soft tire was down by 12.5%. The TPM system signaled an alert, avoiding what eventually could have led to a blowout, since a slow leak was found when the tire was examined. I did an Internet search on TPMS, and found a Mazda CX-5 forum with the following post(s). My Fusion is an 07, a year before they were mandated for all NA cars to have them. My wife's car, sister's car, and any number of other friends, associates, co-workers, etc who have the in-wheel sensors have all had issues with them. Ranging from constant false alerts that the tire pressure(s) was low, to one that leaked or eventually failed. Then there's the issue of people that want to run multiple sets of wheels, whether its just winter/summer or show/snow... its inconvenient and expensive. The ABS systems work just as well, and calculate wheel rotation based on a known outer diameter of the tire at a specific pressure -/+ a value. Its probably not as accurate/ but it doesn't need to be... its just an indication that you should check your tire pressure. You should be doing it periodically anyway, but can alert you to a potential problem. All modern cars have ABS and computers to interpret the information about wheel rotation. It seems strange that so many manufacturers continue to use the expensive and inconvenient individual tire pressure sensor approach.