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New tire pressure sensors.
Metal stems are more durable than traditional rubber ones fitted on non tpms cars but they can still wear out.
While some vehicles audi and bmw most recently use the abs system or indirect system to keep watch for a deflating tire most use a battery powered sensor based in the base of the valve stem assembly to give the most accurate read.
This tpms sensor uses a lithium battery with a five to 10 year.
Starting with 2008 model year cars and light trucks a tire pressure monitoring system tpms has been required for all new vehicles sold in the united states.
Plus the new tpms sensor comes a new fitted tire valve stem.