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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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  #1  
Old 09-02-2014, 12:44 AM
adeljobran718 adeljobran718 is offline
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Mein Auto: 2007 335i coupe
knock sensor going off

My knock sensor keeps on goung off going through forums i read that it could be gas related so i changed to a top teir gas station and put octane boost ran good for 2 or 3 days and limp mode again*ran codes and once again knock sensor plugs changed at 33k miles my car is a 07 335i e92 46kmiles.
any suggestions really apriciated
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  #2  
Old 09-02-2014, 03:33 AM
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DSXMachina DSXMachina is offline
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i see you didnt list any codes that would be a big help because without them we are completely at a loss as to possible causes with the codes at least we can make an educated guess and then tell you what might be the problem then you can determine if the problem is something you want to fix yourself and we can then tell you how to do it but we need to start with the code(s) which you must have or you wouldnt know it was knock sensor related
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  #3  
Old 09-02-2014, 07:10 AM
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CALWATERBOY DUE CALWATERBOY DUE is offline
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Quote:
Originally Posted by adeljobran718 View Post
My knock sensor keeps on goung off going through forums i read that it could be gas related so i changed to a top teir gas station and put octane boost ran good for 2 or 3 days and limp mode again*ran codes and once again knock sensor plugs changed at 33k miles my car is a 07 335i e92 46kmiles.

Do you mean to say there is a warning on your dash, or that you hear it knocking?
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  #4  
Old 09-02-2014, 10:52 AM
adeljobran718 adeljobran718 is offline
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code

The code is 2e69
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  #5  
Old 09-02-2014, 11:01 AM
fdriller9 fdriller9 is offline
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You have a bad knock sensor.

When the engine detects knock, it will adjust fuel, air, timing etc to eliminate the knock.

If this fault is present, it means the sensor is bad or there is a short somewhere in the harness.
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Old 09-02-2014, 11:15 AM
adeljobran718 adeljobran718 is offline
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So you dont think its something causing the sensor to go off?
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  #7  
Old 09-02-2014, 01:51 PM
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DSXMachina DSXMachina is offline
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Quote:
Originally Posted by adeljobran718 View Post
So you dont think its something causing the sensor to go off?
Re-read what fdriller posted. The code means what he says it means; either the wiring, connection, or sensor itself has failed. In my experience it's the sensor 99.9% of the time.
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  #8  
Old 09-02-2014, 02:23 PM
adeljobran718 adeljobran718 is offline
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Alright thanks guys for the information. Is there a website that has them for a better price than dealer i cant find much options online.
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  #9  
Old 09-02-2014, 02:55 PM
fdriller9 fdriller9 is offline
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Try ECS or getbmwparts.
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