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Nox sensor


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I have a NV300 from 2018 with 145 dci engine.

Have the fault message on the display 

"Check anti pollution system" 

When I connect with OBD2 it says

-fault value from Nox sensor "B" -

I have changed the sensor and removed the faulty code but it still comes back. I can start the engine 3-4 times before it get back. Are there several Nox sensors or what does the "B" stand for? 

Any ideas?

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