Finally rolled out the X5. The coolant system refresh is complete. It cranked up on the first try. The 4X4 light went out driving across the driveway. Emissions will take time to set. Only one code/warning appears: Check Coolant Level. It will take time to bleed out the air. Which sensor senses coolant level for the dash? Both lower hose and tank sensors are new. The connections are tight. Which one needs to be replaced or checked?

I need to move one vacuum hose. The small elbow connection is not on yet. I capped it for the time being. Can one someone confirm, the small elbow connection? It's the hose coming over the left fender near the brake booster. I assume it's the fuel tank vent.

The coolant temp seems really low for radiator output. It reached 90C but it took a while. It was cool yesterday. Is this the sensor causing the "Check Coolant Level" warning?

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'06 X5 3.0i - bought @143,123 miles (12/26/20)