Cars that are fitted with the Passive Anti-Theft Systems (PATS), or the FordSecurilock system, cannot have the lock cylinder removed unless the anti-theft transceiver is removed. To change the battery of the pre-2006 model, the first step is to disconnect the negative battery terminal and put the ignition key to the on position and then release the lock cylinder by an awl or a punch of 1/8 inch. A lock cylinder is then fitted with exact alignments and the battery is re-connected back that enables the Powertrain Control Module (PCM) to re-learn its idle and fuel trim strategy. In 2007 and subsequent models, this is done by removing the steering column covers, unlocking the tabs at the anti-theft module and inserting a thin rod to push the release pin outward, then pulling the key out. The ignition switch and tumbler type requires to disconnect the negative battery terminal and steering column covers, and disconnect the ignition switch electrical connector and then lowers the steering column and pulls out the ignition switch. The transceiver used to transmit important information to the BCM and PCM is the anti-theft transceiver that is also a small component hence must be handled carefully when removing and installing. The push button start system substitutes the old ignition system, whereby the voltage of the battery is used to indicate multiple modules to operate the engine and other interior systems and requires a programmed proximity key to switch the ignition on or off. When the push button starting system experiences problems, it can be recommended to have them assisted by a qualified repair facility or local Ford dealership.