S-Class (W221) 2007-2013: S 320 CDI, S 350, S 450, S 500, S 550, S 420 CDI, S 600

Nox Sensor

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Old Nov 1, 2018 | 04:37 AM
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BharatPatel's Avatar
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S350D
Nox Sensor

My engine light came on and they say my NOX sensor needs replacing.
Where is the NOX sensor and is it easy to replace
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Old Apr 14, 2021 | 05:48 PM
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HARALD KRAUSE's Avatar
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MB. 2015 GLK 250 + 1971 250/8 sedan
Nox Sensors are at catalytic converter.

Originally Posted by BharatPatel
My engine light came on and they say my NOX sensor needs replacing.
Where is the NOX sensor and is it easy to replace
Harald Krause.--Have a 2015 GLK 250 .52 k .km. Warning light came on and says YOU HAVE ONLY 9 STARTS LEFT. BLUE FLUID LOW.
Phoned MB Dealer on Broadway in Vancouver. With one start left the next day I made the dealer with the GLK runniig perfectly. 6 hr. later i got it back .They changed
the 2 NOX sensers at the catalytic converter one upstream and one downstream. [$722.40] incl. tax. Had paid for extended warranty but had to pay anyway.

Last edited by HARALD KRAUSE; Apr 14, 2021 at 05:54 PM.
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