Mercury F5RZ-9B989-BA Throttle Position Sensor

This procedure applies to 2008 and earlier V6 models and to 2003 through 2008 four-cylinder models; on other models, the TP sensor is part of the throttle body. Begin by disconnecting the cable from the negative battery terminal. For V6 models, remove the engine cover, noting that the PSP switch is located on the power steering pressure line near the oil filler cap. Next, disconnect the TP sensor electrical connector and unscrew the PSP switch with a wrench. Remove the TP sensor mounting screws and take out the TP sensor. When installing the TP sensor screws on a four-cylinder model, ensure to hand start the screws, as they are self-threading and improper installation could damage the throttle body. Installation is otherwise the reverse of removal. After reconnecting the battery, the Powertrain Control Module (PCM) must relearn its idle and fuel trim strategy for optimum driveability and performance.