Crankcase Ventilation Heater
WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
The crankcase ventilation heater is used to heat the crankcase ventilation system vapor to keep any oil that may be present from sludging in the charge air cooler, turbocharger and intake manifold. The crankcase ventilation heater is located on the crankcase ventilation hose.