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P2201 - Mercedes GL320

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I have a Mercedes Gl 320 Bluetec 2009, and the engine light it's on. O got a diagnosis frim a shop and they told me they got this code : P2201 NoxSensorCircuit Per Bank#1.
Do you know what it is? How can it be fixed?
Thank you

Vehicle: Mercedes GL320 Bluetec, 2009

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