BMW 13627568421 Knock Sensor

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The V8 engines have knock sensors are fitted to the side of the cylinder block, although in the area of the intake manifold. First of all, remove the negative cable and put a cap on the battery terminal to avoid short circuits accidentally. The warning that has to be observed before disconnecting battery is as follows: Before you disconnect the sensor connectors, make sure that you label the sensor connectors, more importantly make sure that knock sensor harness connectors are not switched in order to avoid danger to the engine. After the engine has cooled down the intake manifold has to be removed, also the knock sensor mounting bolthe are on the sides of the cylinder block and have to be removed to take out the sensors. One has to point out the previously installed angle of the knock sensors to the block before the removal process in order to have them reinstalled correctly. Remove the contact surfaces of the engine block and sensors and clean them, torque the knock sensor fastener without overtightening. Upon reinstallation of the intake manifold, re-connect the electrical connectors of the sensor, and position the harnesses in their proper places. Last of all, look for fault codes and erase and reset the memory of ECM.

It is important to be aware of the cautions related to battery disconnection.

In a 6-cylinder engine, knock sensors are bolted to the left side of the cylinder block under the intake manifold.