P11C7 code from a gasoline engine?

Manolito
Sun, 11 Dec 2022 17:41:11 +0000
Maintenance/Repairs

2019 BMW X1 with a B46A engine
CEL illuminated and a generic OBD II reader reports code P11C7, and defines that as a fault with the NOx sensor circuit.
Wait, what? My understanding is that NOx sensors are used only in diesel emissions fluid injection systems. Why would we get that code from a gasoline engine?
BMW-specific code lists that I have found don’t even list this as a valid code for a US market BMW.
The CEL comes and goes, generally corresponding to cold wet weather, which suggests a possible wiring problem somewhere.
I don’t even know where to start to diagnose this. Anyone seen a similar problem?

Thanks!

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