Are your valve stems metal? If they are it is part of the valve stem. If they are rubber there are no sensors and it goes by diameter. I'm putting a set of sensors in a set of BMW rims to run all season tires for the winter on my 2008 3.
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2008 Montego Blue Sedan- Black leather with alum. trim, Step, Active Steering, Paddles, Comfort Access, Sun Shades, Park Distance Control, Nav, HD Radio, IPod & USB adapter, Cold Weather, Premium, Sport.
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