Audi Q5 Turbo Failure Symptoms Point to Boost Issues

Had similar issues with my 2015 Audi A6 3.0 TDI. The symptoms match exactly what turned out to be a combination of boost sensor malfunction and a significant boost leak in the intake manifold. The whistling noise typically indicates air escaping from the turbocharger system. The jerking during acceleration is a classic sign of the engine management system struggling to regulate boost pressure correctly. When the boost sensor fails, it sends incorrect readings to the ECU, causing erratic performance. In my case, the diagnosis revealed cracked intake manifold gaskets and a faulty boost sensor connection. The air intake system needed a complete pressure test to locate all leak points. The turbocharger itself was functioning properly, but the boost leak was preventing it from building proper pressure. This is definitely a serious issue requiring immediate attention. Continuing to drive with these symptoms risks damaging the turbocharger and other engine components. The repair involves: Testing the boost sensor electrical connections, Pressure testing the entire intake system, Inspecting all turbocharger related components, Checking intake manifold seals and gaskets These symptoms typically worsen over time and wont resolve without proper repair.

Thanks for sharing your experience. Currently going through a similar issue with my Q5 and wanted to get your insight. I can relate to the boost leak troubles you mentioned and hearing that pressure test helped identify the exact problem gives me hope. Before I head to a new shop, could you remember roughly what you ended up paying for the full repair? Also curious if the engine light situation stayed resolved or if you ran into any other related issues since getting it fixed?

Since getting my A6 fixed, the engine light hasn't returned at all. The actual repair was much simpler than initially expected, turned out the bad boost pressure sensor was just due to a faulty cable connection. Total cost was 95 Euro for fixing the connection issue, which was a relief since I was worried about more extensive turbo boost system repairs. The pressure test was essential for proper diagnosis, showing that the turbo itself and air intake system were actually fine. Once the sensor connection was repaired, the erratic acceleration and power issues disappeared completely. Fuel consumption returned to normal levels too. The check engine warnings haven't come back in the months since the repair. My advice would be to get a proper diagnosis with a pressure test first, it can save you from unnecessary repairs and help pinpoint if you're dealing with a simple sensor issue like mine or something more serious in the boost system. Most importantly, I haven't experienced any related problems since getting it sorted. The whistling noises and performance issues are completely gone. Just make sure your new shop is thorough with their diagnostic process.

Following up on my initial concerns, finally got the Q5 properly diagnosed and fixed. After finding a reputable specialist shop, they performed a comprehensive pressure test of the intake system. Turns out I had a cracked intake manifold and a failing boost pressure sensor causing all those problems. The repair was fairly straightforward but more expensive than I hoped, 850 Euro total including parts and labor. They replaced the intake manifold, installed a new boost sensor, and checked the entire turbo system. The mechanic showed me the damaged parts and explained how the cracks were causing the boost leak and performance issues. The difference is remarkable, no more engine light, whistling sounds are gone, and the turbo boost is working perfectly again. Acceleration is smooth, and fuel economy is back to normal. Really glad I didnt wait longer as the mechanic mentioned it could have led to more serious engine damage. Looking back, the symptoms were classic signs of boost system problems. Should have addressed it sooner instead of worrying about the previous bad experience with my old mechanic. Lesson learned about finding the right specialist for these kinds of repairs.