In 2.0L four-cylinder models of 2004 and earlier, the first step is to unplug the cable of the negative battery terminal and then elevate the front of the car, and put it on jackstands. Find the sensor of the knock on the reverse face of the block close to the alternator, unscrew the electrical connector of its holder and disconnect. Uninstall the knock sensor, the retaining nut and install the new sensor in the reverse order, not forgetting to tighten the retaining nut to the required torque. Once the battery is reconnected, the Powertrain Control Module (PCM) needs to re-learn its idle and fuel trim program in order to perform optimally. In 2.3L and 2009 2012 2.5L four-cylinder models, the steps are similar, except that the negative battery terminal should be disconnected, the intake manifold removed, the wiring harness removed, and the mounting bolt removed prior to installing the new sensor. To replace the negative battery terminal in the 2008 and older V6 models, disconnect the negative battery terminal, lift the car on the rear side and find the position on the rear side of the block, the knock sensor, disconnect the electrical connector, remove the retaining bolt and sensor, and then reassemble and screw the bolt back. Once again reconnected to the battery, the PCM will have to re-learn its idle and fuel trim strategy. On (2009-2012) V6 models, with two knock sensors, the negative battery terminal should be disconnected, the lower intake manifold should be removed when working with the block-mounted sensor, the wiring harness should be disconnected, and the mounting bolt must be removed and re-attached. On 2013 and subsequent models powered by 1.6L and 2.0L engines, find and remove the connectors of the display of the knock sensor, release them of the intake manifold tabs, and loosen the bolt connecting the sensor to the block. In 1.5L and 2.5L engines, disassemble the intake manifold then disassemble the bolt connecting the knock sensor and the block and reassemble it and clamp the bolts to a recommended torque.