Audi Q2 Vacuum Leak Symptoms & Check Engine Light Alert

Had similar issues with my 2018 Audi Q3 2.0L. The symptoms matched exactly, excessive fuel consumption, hissing noise during acceleration, and check engine light. The air intake system required attention after the intake hose developed a tear near the turbocharger connection. The engine misfire and poor performance were caused by unmetered air entering the system. A vacuum leak test revealed multiple connection points where the intake was compromised. The throttle body also needed cleaning due to carbon buildup that occurred from the unfiltered air entering through the leak. This is a serious issue that needs prompt attention as it can: Lead to long-term engine damage, Cause turbocharger strain, Result in failed emissions tests, Create further vacuum system problems The repair involved: Leak testing the entire intake system, Replacing the damaged intake hose, Installing new clamps, Cleaning the throttle body, Replacing the air filter Proper diagnosis using a smoke test is essential to locate all potential leak points. Without fixing this, the problem will worsen and could potentially damage other components in the air intake system.

Thanks for sharing your experience. I had the same thing happen on my Q2 last winter. The hissing sound and fuel consumption were identical to what you described. After diagnosing, they found a split in the intake manifold and some issues with the turbocharger seals. Did any other problems surface after you got it fixed? Also wondering what the total repair cost was for you, as the quote I got seemed quite high at the time.

The repair resolved all issues completely and it was far cheaper than I expected. The leak detection test pinpointed exactly where the intake hose was damaged, making the fix straightforward. Total cost was 100 Euro for replacing the faulty hose and labor. Since fixing the air intake system leak, fuel economy returned to normal and the hissing noise disappeared entirely. The check engine light cleared after the repair and hasnt returned. The throttle body response is much smoother now too. No additional problems have emerged in the months following the repair. Getting it fixed early prevented any damage to the turbocharger or other engine components. Regular maintenance checks show everything is running as it should. Your split intake manifold issue sounds more complex than my intake hose problem, which explains the higher repair quote you received. When intake system issues involve the manifold or turbocharger seals, costs typically increase significantly due to more extensive labor and parts.

Thanks for the input. Just wanted to share how this worked out. Finally took it to a new mechanic and got it sorted. They found multiple vacuum hose leaks and a cracked fitting on the air intake system. The throttle body was also pretty gunked up, which was contributing to the poor fuel economy. The whole repair came to 780 Euro including parts and labor. More than I hoped but less than I feared. They did a full diagnostic and smoke test to find all the leaks. Took about 4 hours total to fix everything. Car runs so much better now. The engine misfire is completely gone and fuel consumption is back to normal. No more hissing sounds either. Really glad I got it checked out before it caused more damage. Lesson learned about not putting off these kinds of repairs.