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if it only gives "Drivetrain" warning but the car allows you to drive without entering the protection mode, it is likely to be the auxiliary water pump.
when it is faulty, it causes the sensors to go crazy as you stated. if you are able to access the hidden menu, you can observe that your water temp becomes unstable (jumping 20 degrees and goes down etc)
if that's the case the part number is 11518616992. you should also refill the antifreeze and coolant too after changing the water pump.
it is a common problem on n13 engines.
other possibility is that there might be a leak on your turbo hose.
good luck
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