Coolant sensor code?

Hello, the coolant temp sensor uses two wires, one of which the DME sends out a 5v reference and the other wire is a ground through the DME. The coolant temp sensor then pulls that 5volts down according to the resistance it has as the temp changes. So with a signal high code, the sensor is either missing its ground or the sensor is open circuit internally. So unplug the sensor and one wire should read 5volts and the other should be the ground wire. You can first check the sensor for resistance, if it reads OL, (out of limits) then its and open internally, if it reads some resistance, next check for continuity on the ground wire to the DME to make sure its not an open circuit. You can also check your live scan tool data, and when a temp sensor is open circuit in some way they will usually read -40f degrees. I'm going by the service info for a 2016 BMW 328i Sedan (F30)
L4-2.0L Turbo (N20), I'm not sure if that's the correct model, but coolant sensors basically all work in the same way, either an open ground or open sensor will set a circuit high code.

The reason they ground the sensors through the computer is so there isn't any interference with the signal, so this ground may not have continuity to battery ground.

Did I have the correct model selected for service info? Or you can give me the vin and I can pull up the service info by that, its much faster
2016 BMW 328i Sedan (F30) L4-2.0L Turbo (N20)

These are the models listed.

Different models have different wire colors for the coolant temperature sensor.

So it looks like most of the gas engines for this model have the coolant temp sensor in the same location, also identify it by the wire colors, Black/Grey and White. See if that's correct. Ill see if there are any connectors in between the sensor and DME as well.

Here is some further info on the ECT operations, note the resistance to temperature chart, which can be used to check if the sensor is within range or skewed, Ive added this because I have had coolant temperature sensors that were out of range but did not set a code, I know you have a code in this situation, but its important to know how the component you're testing works. And one other thing I see with this specific sensor is that it reads all the way down to -55c degrees which is -67f degrees, so with the sensor unplugged the scan data may read -67f or -55c and not -40f like most vehicles here read. But with it unplugged you should still read 5volts on the two wires of the sensor.
It also gives a resistance operation range of 216k Ohms (216,000 ohms) to 33 Ohms depending on the temperature.

Okay, does the sensor read any resistance on it? Around 70f degrees it should read a very low resistance according to the graph provided in service info.

Just start with the lowest setting then work your way up, if the sensor is around 70f it looks like it will be below 1000 ohms (1k).

If its open circuit inside the sensor you won't getting any reading on any setting, it will read just OL all the time.