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Discussion Starter #1
So when do the expensive Knock Sensors crap out? At what mileage?
Also bmw or OEM (what brand)
Share your experience.

I am currently doing a big job (timing chain/valley pan/cooling system). I recall coming across a few posts on knock sensors. Are these bound to fail? If so? When? I would hate to come back in the next 5k. I would also hate for the job bill to go up haha

I have a non vanos 540i
103k on the clock
 

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Discussion Starter #3
If I had to guess? Never.
I am praying hard that your guess is the correct and indisputable answer:bigpimp:

I just remember coming across a couple bad knock sensor posts, and knowing bmw and its long preventative maintenance list :eeps:
 

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Discussion Starter #7
+1
I don't think this is a PM item although while you are there you could check things like the resistance of the sensors and make a determination.
BlueBee has a link/thread on this that gives interesting results. It doesn't answer your question of PM replacement but would tend to read it as a "no, not until there are issues".
http://www.bimmerfest.com/forums/showthread.php?t=542640
Thanks! Ill take a look at it :thumbup:
 

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Depending on where they are located and how easy it is to access them, on the e36 you had to take the manifold off to get at them, so if i was in there and they were still the original ones, i threw new ones in for piece of mind so I wouldn't have to go back in there again if they went bad.
 

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Depending on where they are located and how easy it is to access them, on the e36 you had to take the manifold off to get at them, so if i was in there and they were still the original ones, i threw new ones in for piece of mind so I wouldn't have to go back in there again if they went bad.
It's a bit more on the m62. It's basically 2 steps short of a valley pan job. Gotta remove the coolant return tubes that run from the rear accumulator to the WP.
 
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