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Old 09-25-2007, 07:24 PM
cn90 cn90 is offline
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Location: Omaha NE
Join Date: Mar 2006
Posts: 14,352
Mein Auto: 1998 528i 5-sp 140K+
4 knock sensors on V8

Item #19 in the above link.

Replacing the knock sensors on the 540i is a royal pain in the butt.

There are 4 knock sensors. They are located in the V of the motor on both banks. Replacing them involves removing the intake manifold. If you need to replace the knock sensors on bank 2 (driver side head) you must drain the coolant, disconnect the water manifold on the back of the motor to remove the 2 long coolant pipes that run between the heads below the intake manifold. The bolts on the knock sensors will not clear these pipes.

If you are doing the knock sensors, you might was well replace your valley pan gasket, water manifold gaskets, o-rings, intake manifold gaskets and your CCV. The parts for all of that will run you a decent sum of money.... Then about 6 or so hours of labor on top of that.
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