Jeep 5149188AA 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.

Installation follows the reverse order of removal, ensuring proper torque on the knock sensor/fastener.

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.

To diagnose the Throttle Position Sensor (TPS), disconnect the electrical connector, use a digital ohmmeter to check the resistance readings while moving the throttle lever, and replace the TPS if readings are incorrect.

The knock sensors for the 3.6L V6, 3.7L V6, and 4.7L V8 engines are located on top of the block, in the valley between the cylinder heads, underneath the intake manifold.

Oxygen sensors, located in the exhaust manifold or pipe, provide a variable voltage signal based on exhaust oxygen content, helping the computer adjust the fuel/air mixture.