Lexus 89615-20090 Knock Control Sensor

To replace the knock sensor, begin by releasing the pressure from the fuel system and disconnecting the negative battery terminal. For four-cylinder models, remove the intake manifold and disconnect the electrical connector to access the knock sensor. Slide the sensor off the mounting stud, install the new sensor, and tighten the nut to 15 ft-lbs. As for the V6 engine models, remove the lower intake manifold. After that, unplug the knock sensor harness connector. Remove the sensors, clean the mounting surface, and install the new sensors. Tighten the bolts securely. In both cases, reinstall any parts that were removed and refill the cooling system.

For four-cylinder models, the knock sensor is on the engine block's backside, requiring intake manifold removal. Disconnect the negative battery cable, remove the intake manifold, and disconnect the sensor's electrical connector. Remove the retaining nut and the sensor. During installation, angle the sensor's electrical terminal slightly below the horizontal. For V6 models, the knock sensors are between the cylinder heads, also requiring intake manifold removal. Disconnect the battery cable, and remove the intake manifolds and water transfer hose. Disconnect the sensors' electrical connectors and either unscrew the sensors or the retaining nuts/bolts.

Begin by disconnecting the negative battery cable. Then, proceed to remove the intake manifold to gain access to the knock sensor. Afterward, disconnect the electrical connector of the knock sensor, remove the retaining nut, and take out the knock sensor.