Randy

Thanks for the inout

Hello from Canada. Last year I purchased a 2016 TT S Line. Recently I have gotten a P2556 error code indicating coolant level sensor issue. Audi tech feels that the thermostat needs replacing, but the coolant level sensor is in the expansion tank. The temperature gauge is erratic going from 50 to 100 degrees but usually down near 50. Also just recently noticed that the cruise control does not work. I found an old thread from 2018 from another member who had identical issues and symptoms but don't know if the error code and cc issues are related. Questions, if replacing the thermostat should I do the water pump as well? car has 176K km. Cost of thermostat unit is $800Cdn and water pump another $250 and quoted 5-6 hours labor at $185/hr. Thinking of replacing the expansion tank as it appears that the coolant level sensor is not easily replaced into an existing tank. Cost of new tank is only$60 so not too much wasted if it doesn't work. Any ideas or suggestions would be appreciated. thanks Randy