you're supposed to reset the tire setting after adding air to the tires or when putting in new tires otherwise the sensors go off...

so what you experienced was normal...

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07 650i Cabrio CPO, Titanium Silver
Black Matte Grill
Dark Birch Wood Interior and Shifter
HUD, Cold Weather and Sports Package
Logic 7 Sound
Aluminum Racing Pedals
K&N Air Filters
Rays Master Piece REM 20" Forged wheels w/ Conti Extreme DWS