Hello , thanks for your question in the autoaid Community.
Your described fault Code means: NOX Sensor faulty
There is an actual localisation plan from Daimler:
Point 1: battery check seam sealing.
Point 2: check cross beam under Wintschutzscheibe Nahtabdichung.
Point 3: Mounting Check sunroof tube to the sunroof.
Point 4: check bonding roof planking.
Point 5: Check bonding Wintschutzscheibe points 1 4: can be refinished in n.I.O diagnosis with a transparent sealant.
In addition, components that might have come with water into contact z.B should electrical connectors, etc.) be tested.
If your car has guarantee, so you should go to your Dealer and then let it repair there.