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Old 12-18-2013, 09:43 AM   #9
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Join Date: Nov 2006
Location: SoCal
Posts: 1,201
My Ride: 06 M5 & 03 325i
Typically you'll get a fault code for excessive slip. Another way to tell if your TC is on its way out is to cruise at 80mph on straight level road and see where the RPMs are. On a good TC you should be around 2700 RPM. When my TC was slipping it was always around 2900 not to mention I have the fault code.
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