VCDS can be very helpful in this case. You can start with output tests for the ele tests but since the sensors are causing issues. You’ll have to search and find the voltage or switch for the coolant tank for the coolant level I think its just noted as a 0 or 1 in vagcom…
Since I don’t have the switch or voltage blocks memorized. Try this and this should be the better way to go as you’re able to use this as a physical test.
Go and loosen the bolts for the coolant reservoir. Make sure you can move the tank a bit and get to the coolant tank sensor wire… Then when cold start the car if you get the code for no coolant make sure there is obviously coolant in the tank and that it has covered past the min line. Once you have done that unplug the sensor for the coolant tank level… check the dash and see if anything changed… Most likely nothing will.
After that make sure to take a small wire and just use that as a jumper wire in the wire harness acting as the signal. Just jump the posts in the wire connecter. This will be doing the same thing as if the coolant tank was full and passing the electronic pulse back to the ECU. If you do this jumper and you still get a code on the dash. There is a strong case for an issue in the wire harness itself. If you can turn on and off the code on the dash each time you move the jumper wire. Then the coolant tank sensor is bad… and it’s a really easy dumb sensor. It’s either on or off… So… Try that. I have seen on off Audi sensors go bad. So try that and let us know.
