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On the E60 the FTM only picks up a flat tire for RFT (meaning RFT with 0 psi) because as ceb said the RFT sidewall is stiff and it will create a problem for the FTM to pick up the slight difference of tire pressure as presented in a slow leaked situation.
I know because the comp prompt me about a flat on my RFT then I take it into the shop and they say no air inside the tire. Couldn't say is a design flaw as RFT tires are design to "Run flat" and you are not suppose to plug your tire on a RFT.
The best solution is get rid of the RFT then the FTM will pick up a slow leak.
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2011 F10 - Sophisto Grey / Cinnamon Brown
You can find me in E60.net too!
Gone (but not forgotten)
2005 E60 523i, 1999 E39 523i, 1998 E46 323i
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