Nox Sensor 523i

fsiarazvan · 08-18-2025, 02:50 PM

Hello! I have a F11 523i 2011.
I have the following error in the picture. Now my question is... is the cable broken or is the error general and may be non-functional?
Which one would that be? Nox? The one in the back that also has that small plate or one of the two in the front on the exhaust manifold near the block?
Thank you!
Image with nox error

Cvx5832 · 08-20-2025, 09:35 AM

The one at the exhaust manifold is the oxygen sensor. My guess is a rodent got to the wiring.

08-18-2025, 02:50 PM	#1
fsiarazvan New Member 0 Rep 5 Posts Drives: Bmw 523i Join Date: Aug 2025 Location: Bucharest Romania iTrader: (0)	Nox Sensor 523i Hello! I have a F11 523i 2011. I have the following error in the picture. Now my question is... is the cable broken or is the error general and may be non-functional? Which one would that be? Nox? The one in the back that also has that small plate or one of the two in the front on the exhaust manifold near the block? Thank you! Image with nox error
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08-20-2025, 09:35 AM	#2
Cvx5832 Private First Class 67 Rep 112 Posts Drives: ‘15 535i M-Sport Join Date: Jul 2018 Location: Walnut Creek, CA iTrader: (0)	The one at the exhaust manifold is the oxygen sensor. My guess is a rodent got to the wiring. __________________
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