Anybody actually replaced a bad knock sensor?

blown07 · 05-01-2015, 08:50 AM

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.

335NJ · 05-01-2015, 11:14 AM

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.

blown07 · 05-01-2015, 12:58 PM

Quote:

Originally Posted by 335NJ

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.

335NJ · 05-01-2015, 01:17 PM

Maybe try cleaning the connector before you replace it?

05-01-2015, 08:50 AM	#1
blown07 Lieutenant 202 Rep 449 Posts Drives: 335i Join Date: Jul 2013 Location: Tijuana iTrader: (0)	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. __________________ 335i FBO,Meth,JB4,Sutphin flash,LSD,GCLites 11.25@127.4 on NT05R 335xi FBO,Meth,JB4,Sutphin flash,VTT stage1 11.38 1/4 - 7.30 1/8th - 3.35 0 to 60 @ 0C
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05-01-2015, 11:14 AM	#2
335NJ Colonel 533 Rep 2,872 Posts Drives: 2008 335i 6MT E90 Join Date: Feb 2014 Location: NJ/Philadelphia Suburbs iTrader: (1)	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, 01:17 PM	#4
335NJ Colonel 533 Rep 2,872 Posts Drives: 2008 335i 6MT E90 Join Date: Feb 2014 Location: NJ/Philadelphia Suburbs iTrader: (1)	Maybe try cleaning the connector before you replace it?
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