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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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Old 01-23-2013, 05:15 PM
CurtSmall CurtSmall is offline
Registered User
Location: Piedmont, SD
Join Date: Dec 2012
Posts: 13
Mein Auto: 540i/528i
missing knock sensor

Greetings from the Black Hills. I have newly aquired a 2000 528i sport with the I6. I have been replacing sensors, and I'm down to the knock sensors. I went to install the new sensors, and I found the harness side recepticle, but no knock sensors! ...anywhere! And this would explain why I keep getting that code. My problem is I have no idea where the mounting points are. I see several threaded female openings on the block, and from the viewing angle I have, I don't see any obvious ones to start with. Having searched the forum for these questions with no luck, I decided to post these 3 questions:

Where are the mounting holes for the two knock sensors?

If I need to remove other components to install the new sensors, is there a DIY thread on here?

Does anyone know the size/thread cut of the mounting bolts? (I'm pretty sure mine are MIA)

Thanks in advance for any beta that can be shared.
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