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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 02-07-2012, 01:02 AM   #1
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Project M54 Engine: Knock Sensors

Knock sensors

Link to posts in the project

Replacing the knock sensors is easy, but getting at them is not. You will need to remove the intake manifold first to gain access to them. This is a big job. Refer to my post on how to do this.

Photos below show what to do once the manifold is off.

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Old 06-14-2012, 04:58 PM   #2
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it's interesting how a knock sensor works. it's basically a microphone that listens in on the block for a particular frequency (knocking)
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Old 08-14-2016, 05:01 PM   #3
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Don't need to take off your manifold.
Only remove intake muffler and starter.
Did this today in half an hour
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Old 08-15-2016, 08:00 AM   #4
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Knock sensors are piezoelectric sensors. They convert vibrations into electrical energy. They are made to provide an electrical signal at specific vibration frequencies.
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Old 08-21-2016, 09:00 PM   #5
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Originally Posted by ReneBMW View Post
Don't need to take off your manifold.
Only remove intake muffler and starter.
Did this today in half an hour
All of his 'Project M54 Engine' threads already have the motor out of the car.
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