Jeep 68001451AA Knock Sensor

Due to the work involved, both knock sensors should be replaced at the same time. To replace the knock sensor(s), relieve the fuel system pressure and drain the cooling system. Disconnect the negative battery cable. On 2007 2.7L engines, remove the cylinder head from the rear cylinder bank. On 2008 and later 2.7L engines and all 3.5L and 3.6L engines, remove the lower intake manifold. On 3.6L engines, also remove the engine oil filter housing. On 2.4L engines, remove the intake manifold (2014 and earlier) or the exhaust manifold (2015 and later). Disconnect the electrical connector(s) from the knock sensor(s). Remove the mounting bolt(s) and detach the sensor(s) from the engine block. Installation is the reverse of removal. Tighten the knock sensor to the specified torque. On V6 engines, refill the cooling system.

The knock sensor is located on the side of the engine block, in front of the starter, under the intake manifold.

To replace the knock sensor, start by disconnecting the cable from the negative terminal of the battery. Then, remove the engine cover and disconnect the electrical connector(s) from the knock sensor(s). Next, remove the mounting bolt and detach the sensor from the engine block. Finally, installation is the reverse of removal, making sure to tighten the knock sensor bolt to the specified torque.