2025 Audi Q5

After the automatic start/stop system engages, the engine stalls and completely shuts off shortly after the vehicle begins moving again. This occurs after the vehicle restarts and travels only a few feet. When the stall happens, the vehicle loses power and the engine stops functioning while the car is in traffic. This has occurred two separate times: once on a busy highway and once while entering a roundabout. Both incidents created a dangerous situation where the vehicle could not maintain power in active traffic and could have resulted in a crash. A yellow emissions warning light also appeared on the dashboard. The dealer indicated that an intermittent oil pressure sensor code was present but no parts were replaced and no corrective action was taken. The dealer reset the system and stated they could not reproduce the problem. The vehicle is now being returned to me without repair despite the safety risk. An engine stall immediately after the start/stop system restarts the vehicle creates a serious hazard because the vehicle can lose power in the middle of traffic. I believe this issue may be related to the automatic start/stop system or an oil pressure sensor fault affecting engine operation.

When attempting to accelerate rapidly (I.e. passing gear) the engine immediately begins to lose power. Audi dealer investigated and determined it was “TURBO LAG”. This situation happened multiple times at different speeds. When trying to accelerate to pass another vehicle or to merge onto a freeway are the scariest and most dangerous instances. Taking your foot off the accelerator does allow the engine to regain speed. The salesman that we had experienced this on a test ride with me. In reading previous turbo problems with Audi/ Volkswagen vehicles, I’m concerned that this may become a safety issue. This also occurred with the loaner vehicle they gave me which was the same year and model.