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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Anybody actually replaced a bad knock sensor?



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      05-01-2015, 09:50 AM   #1
blown07
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Anybody actually replaced a bad knock sensor?

A couple weeks after I did the HPFP recall and DME update on my '07 335i I got reduced power mode 2 mornings in a row the exact same distance from home. Car was fine coming back from work. Code showed a knock sensor signal error. I'm very sceptical that this is actually the problem but I am picking sensor pair up today to try. I may flash back to the orignal bin if the new sensor doesn't help.

I have already taken the sensor pair out and there is nothing obvious. Do these things actually go bad as a search revealed very little history for the N54's ??

Any help appreciated.
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      05-01-2015, 12:14 PM   #2
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Some good info http://www.n54tech.com/forums/showth...ighlight=Knock

However this is a knock sensor issue related to upgraded components causing the "false knock", if I remember correctly.
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      05-01-2015, 01:58 PM   #3
blown07
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Quote:
Originally Posted by 335NJ View Post
Some good info http://www.n54tech.com/forums/showth...ighlight=Knock

However this is a knock sensor issue related to upgraded components causing the "false knock", if I remember correctly.
Yes thanks I saw that one when it first came out. I will change the sensors and see if that helps with the code. I haven't had any problems with false knock according to my logs.
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      05-01-2015, 02:17 PM   #4
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Maybe try cleaning the connector before you replace it?
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