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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N47 and N57 Turbodiesel Engine / Drivetrain / Exhaust Modifications > Knock sensor common failure on F30 328d?
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      07-07-2017, 04:00 PM   #1
NinTenTom
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Knock sensor common failure on F30 328d?

Just had a CEL come on for about a week and went away afterwards. Car still felt like normal when driving on the streets and highway though.

Dealership said the error code said it was a faulty knock sensor. Is this a common issue on this engine of ours? Is there a DIY on replacing it for future reference?

Edit: looked at the paperwork and it's the Nox sensor

Last edited by NinTenTom; 07-07-2017 at 06:03 PM..
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      07-07-2017, 05:38 PM   #2
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Quote:
Originally Posted by NinTenTom View Post
Just had a CEL come on for about a week and went away afterwards. Car still felt like normal when driving on the streets and highway though.

Dealership said the error code said it was a faulty knock sensor. Is this a common issue on this engine of ours? Is there a DIY on replacing it for future reference?
Never heard of one before (all 5 forums that I monitor.)

These are often way down underneath and hard to reach...
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      07-07-2017, 06:07 PM   #3
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Originally Posted by floydarogers View Post
Never heard of one before (all 5 forums that I monitor.)

These are often way down underneath and hard to reach...
Either way I'm glad I brought it in before my factory warranty ended. The part alone is close to $700 after looking at Pelicanparts.

Here's the location/details of the Nox sensor they replaced if anyone has this issue in the future:
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      07-11-2017, 08:09 AM   #4
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Whats the update on this? Any recalls by chance? My CEL has been on and when I check it at autozone its for the NOX sensor(s) too. Im not sure if its one or both, or if its something that triggered it.
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      07-12-2017, 12:17 AM   #5
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Originally Posted by jdr78569 View Post
Whats the update on this? Any recalls by chance? My CEL has been on and when I check it at autozone its for the NOX sensor(s) too. Im not sure if its one or both, or if its something that triggered it.

I guess my last post wasn't clear enough. No more CEL light since they replaced the sensor.
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      07-15-2017, 07:57 PM   #6
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Quote:
Originally Posted by jdr78569 View Post
Whats the update on this? Any recalls by chance? My CEL has been on and when I check it at autozone its for the NOX sensor(s) too. Im not sure if its one or both, or if its something that triggered it.
It's a common fault with the part, mine went out on the test drive before I even bought the car, but I don't think they've turned it into a recall just yet.
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      07-17-2017, 06:47 AM   #7
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It's a common fault with the part, mine went out on the test drive before I even bought the car, but I don't think they've turned it into a recall just yet.
DANG! Well one can only hope . I still have some parts and retrofits to do; everything in my living room. So after all that and cleared out ill start on the NOx sensors. Seems its gone this long with no issues i dont see it waiting another month or so
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