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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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  #26  
Old 05-31-2011, 05:32 PM
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Flug540 Flug540 is online now
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Mein Auto: 1998 BMW 540i 6-spd
Thanks guys, you are too kind

I figured instead of getting new sensors that are at least $70 a piece and will fail the same exact way, just rebuild my original ones. The insulation I used is silicon coated fiberglass rated up to 200C so should be plenty. It seems it doesn't actually take long for the original BOSCH insulation to fail. I replaced my intake camshaft position sensor a year ago and now noticed that the cable became very stiff already...
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  #27  
Old 01-22-2013, 03:57 AM
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There's a quest for a method of testing the BMW E39 knock sensors over here today:
- > E39 (1997 - 2003) > knock sensor ohms
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See also: E39 Bestlinks & How to easily find what you need, in seconds!
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  #28  
Old 01-24-2013, 04:48 AM
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Cross referencing to this knock sensor thread today:
-> E39 (1997 - 2003) > missing knock sensor
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  #29  
Old 01-24-2013, 04:53 AM
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For reference, here's a thread that shows pictures of the knock sensor in situ:
> E39 (1997 - 2003) > kNOCK SENSOR 1



EDIT: Since this thread is the canonical one in the bestlinks, here's a set of related E39 knock sensor threads:
etc.
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Last edited by bluebee; 01-24-2013 at 05:04 AM.
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  #30  
Old 11-18-2013, 09:46 PM
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An important question was asked today in this thread:
> E39 (1997 - 2003) > Is there any way to tell whether the piezoelectric knock sensors are activating?

Quote:
It may be impossible to determine, but, I ask because it would be very useful if we could determine whether the piezoelectric knock sensors have activated in, say, the last FTP.

Is there any register that holds a value that we could read after the fact which would tell us whether the knock sensors have been activating?

If not, can we read an indirect value that implies the same thing?

(For example, how would we determine if the timing had been automatically retarded in the past FTP, due to signals from the knock sensors combined with other factors?)
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