Emissions warning light on E46 330i

[Mr_Sukebe]

I've just had the emissions warning light pop up on the dashboard of my 330i. I'm assuming that it's simply because of drift on the fueling, and that this will be resolved when it's next service (due in the next few weeks).
Am I right, or do I need to worry about this?

[baz1985]

Exhaust Cam Sensor

[Mr_Sukebe]

As it happens, the light has now gone off again. I'm guessing it was simply an offshoot of the wet conditions.