mbwillgrubs

The last few times I have taken extended drives in my 2013 CL63 (35k miles) warning lights have illuminated the dash in a spectacular sort of way. It did it a couple of times and did not set a code (or if it did it went away on its own). The last time it did set a C0031 code which research says is a left side wheel sensor.
I removed the wheel for a cursory look and general cleaning of contacts, etc. and found nothing of note. I did order a new one but have yet to receive it.
Anyone have any thoughts? I am hoping for a simple replacement and happy days. Best,