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      04-04-2008, 07:52 AM   #2
creepy coupe
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Drives: M235i
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I'd ask myself how long does it take to do these checks, as for tyre pressures, I think I'm right in saying the system compairs them against each other and if ones down and the rolling radius is altered, then it flags a warning, if they all loose a bit of pressure it my take a while longer to show up.