4D16 DeNOx System efficiency efficiency at low

bmw335d · 11-21-2017, 06:02 PM

Hey Guys,

I am getting this code logged in Carly every couple hundred kms but no engine light.

If there is no engine light, then no issue right? Just wondering why it's being logged.

I got my Ontario Emissions test coming up and concerned if this error will cause the car to fail the emission test if there is no Check Engine Light?

My 335d is a 2009 with 206,300 Kms.

Thanks!

335dsl · 11-21-2017, 06:29 PM

Looks like it's your NOx sensor. I believe there is 2 if I'm not mistaken.

charlie fairmont · 11-21-2017, 08:33 PM

A cheap place to start is to drain the old def and replace it with fresh stuff. Clean the def injector too (just soak the nozzle end in distilled water). Sorry, can't comment your upcoming emissions test.

Also check to see if bmw extended the NOx sensor warranties in CA. I believe they did in the US. You may get lucky 'cause they're not cheap. Good luck.

11-21-2017, 06:02 PM	#1
bmw335d Second Lieutenant 111 Rep 247 Posts Drives: X3 M40i, 335d Join Date: Sep 2010 Location: Toronto, Ontario iTrader: (0)	4D16 DeNOx System efficiency efficiency at low Hey Guys, I am getting this code logged in Carly every couple hundred kms but no engine light. If there is no engine light, then no issue right? Just wondering why it's being logged. I got my Ontario Emissions test coming up and concerned if this error will cause the car to fail the emission test if there is no Check Engine Light? My 335d is a 2009 with 206,300 Kms. Thanks! Attached Images
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11-21-2017, 06:29 PM	#2
335dsl Private First Class 14 Rep 112 Posts Drives: 335d jbd Join Date: Apr 2017 Location: Chicago iTrader: (0)	Looks like it's your NOx sensor. I believe there is 2 if I'm not mistaken.
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11-21-2017, 08:33 PM	#3
charlie fairmont Captain 509 Rep 603 Posts Drives: His & hers, GC & X5 Join Date: May 2015 Location: Jax, FL iTrader: (0)	A cheap place to start is to drain the old def and replace it with fresh stuff. Clean the def injector too (just soak the nozzle end in distilled water). Sorry, can't comment your upcoming emissions test. Also check to see if bmw extended the NOx sensor warranties in CA. I believe they did in the US. You may get lucky 'cause they're not cheap. Good luck.
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