Three problems related to water pump have been reported for the 2015 Audi A3. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2015 Audi A3 based on all problems reported for the 2015 A3.
Check engine light came on in October 2020 car was slow to take off for several weeks and seemed to take time to shift gears. Took to Audi mechanic and had to replace water pump -w/thermostat housing & intake manifold. Now I'm April 2021 car is back in shop because it wouldn't shift out of 1st gear suddenly when I was driving with my daughter in the car, I pulled over in a parking lot to turn car off and then got an error message stating transmission malfunction cannot reverse and had to have the car towed to mechanic again. I'm told it needs mechatronic unit replaced, replace timing cover due to oil leak, evap leak and wiper fluid is leaking.
After recent car inspection due to recall for passenger occupant detection I was informed that water pump was leaking and it needs to be replaced. Vehicle has only 55 000 miles on it. Other Audi models appear to have the same issue and they have been recalled, however no recalls have been issued for Audi A3 2015. As a manufacturer Audi must take the responsibility for faulty parts and it should replace them on their own expense.
The water pump/thermostat housing is leaking coolant out of the engine. This occurs on nearly all mqb chassis vw/Audi's with the ea888 gen 3 2. 0 tfsi engine. It is a widely known issue.