I recently acquired a 2015 VW Jetta TDI, and while someone was taking a long trip, in cold weather, the oil light came on. A yellow light, which does not match any indicators in the owner's manual.
My suspicion is that it is an oil level indicator, but the car has not returned from the trip.
The outside air temperature was cold (-10C) and several hundred miles later the indicator went out.
At all times the oil level was at the top of the hash mark on the dip stick.
What sensors are on the EA288 engine for oil? Pressure, obviously. Level? Perhaps temperature?