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Message: <blockquote data-quote="willie" data-source="post: 535294" data-attributes="member: 107">in USA, the physical TPMS is compulsory, car built 2007 onwards (direct TPMS)... however in malaysia (not sure about in the CBU), the car computer is using the ABS, traction control (indirect TPMS) etc to determine that tyre is deflating/flat or not rather then a physical unit that measure the exact PSI of the tire... there is advantages and disadvantages for direct and indirect TPMS...have a look at the below video to see the differences (the audi in the video is using indirect one):[video=youtube;yceyIAvV_9o]http://www.youtube.com/watch?v=yceyIAvV_9o[/video]</blockquote>