Hello
Just bought my 4th Explorer a 06 and the TPMS sensor gave a warning on dash (not the low air light). I took it to Firestone to get 4 new http://www.walmart.com/cp/1077064?povid=cat121828-env999999-moduleA072012-lLinkGNAV1_AutoTires_Tires and they said one of the sensors was bad and quoted me a price of 200 to fix/replace it. I have been looking and see there is a valve sensor and a banded sensor (I think I have this one). Which parts besides sensor need replacement and can I use aftermarket (Dorman) or should I use OEM parts and what is the approx. price of part. I think they are charging too much but want to confirm this and see what my options are.

Thanks
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