Check the listing for details. 1999-2001 FORD EXPEDITION F150 ANTI THEFT PATS TRANSCEIVER PN: XL3T-15607-AC. Condition: Used. Listed at 36.99 USD. Expedition/Navigator PATS Passive Anti-theft System Oem Part # XL3T-15607-AC Before you buy this item make sure you find out what took your TRANSPONDER out or caused it to fail. Your vehicle MUST be deemed safe via a ASE certified shop before they install this item. This TRANSPONDER is NOT intended to be sold to the end user. Proof of install and data via a certified mechanic with a written repair order justifies a 30 day return for at my discretion. If you are the buyer and the end user there is NO WARRANTY. This TRANSPONDER has security markings for those who think they can send me there old one in return. If i determine a return is warrantied buyer pays all return shipping cost. FREE SHIPPING 30 Day Money Back Satisfaction GuaranteeExpedition/Navigator PATS Passive Anti-theft System Oem Part # XL3T-15607-AC Before you buy this item make sure you find out what took your TRANSPONDER out or caused it to fail. Your vehicle MUST be deemed safe via a ASE certified shop before they install this item. This TRANSPONDER is NOT intended to be sold to the end user. Proof of install and data via a certified mechanic with a written repair order justifies a 30 day return for at my discretion. If you are the buyer and the end user there is NO WARRANTY. This TRANSPONDER has security markings for those who think they can send me there old one in return. If i determine a return is warrantied buyer pays all return shipping cost. FREE SHIPPING 30 Day Money Back Satisfaction Guarantee