Audi Q2 Stalling & Power Loss from Fuel Regulator Issue

Last month I dealt with nearly identical symptoms on my 2019 Audi Q3. The engine stalling and power loss initially pointed to the fuel pressure regulator, but diagnostic testing revealed a more complex issue. After changing the fuel filter, the fuel rail pressure sensor was reporting incorrect readings, causing the engine management system to compensate incorrectly. The problem turned out to be debris from the old filter that had made its way into the fuel rail during the replacement process. The repair required: Cleaning the entire fuel rail system, Replacing the fuel pressure regulator, Installing a new fuel pressure sensor, Performing a complete system reset This was a serious issue that required immediate attention, as continued driving could have damaged the fuel injectors and catalytic converter. The problem wasnt the fuel filter change itself, but rather how small particles had affected multiple components in the fuel delivery system. A professional garage should be able to confirm this by connecting a pressure gauge to the fuel rail and measuring actual fuel pressure against the sensor readings. Consider requesting the diagnostic data logs before and after repair to verify the fix was successful.

Thanks for sharing your experience with the Q3. Just went through something very similar with my Q2 last month. The engine misfire and stalling issues were really worrying me too. In my case, it turned out the fuel pump was failing along with a faulty pressure regulator, causing significant pressure drops in the system. Can I ask what the total repair cost was in your case? My bill came to around 850 Euro including parts and labor, which seemed reasonable given the components involved. Also wondering if youve had any recurring check engine light issues since the repair?

Good news, my Q3 hasnt shown any engine misfire or rough idle problems since the repair. The fuel pressure regulator replacement solved the issue completely. No more check engine lights either. My total bill was much lower since only the fuel pressure regulator was defective, not the entire fuel pump like in your case. In total, I paid 485 Euro, this covered parts, labor, and the 45 Euro diagnostic fee to clear the error codes after the new fuel filter installation. The mechanic did a thorough job testing the fuel pressure and sensor readings after the fix to ensure everything was working properly. Given your more extensive repairs with both the regulator and fuel pump, 850 Euro sounds like a fair price for the work done. The key was catching these issues early before they could cause damage to other components like injectors or sensors. Regular maintenance has kept the system running smoothly since then.

I took my Q2 to a trusted mechanic last week after our discussion here. The diagnostic confirmed what we suspected, both the fuel pump and pressure regulator were failing. The rough idle and check engine light issues matched exactly what you described. The repair went smoothly. They flushed the entire fuel system, replaced the faulty fuel pump and pressure regulator, and performed comprehensive pressure testing. The total came to 850 Euro, which seemed reasonable considering the parts and labor involved. Been driving for about a week now and the difference is night and day. No more stalling during idle, power delivery is back to normal, and the check engine light has stayed off. The mechanic explained that catching it early prevented damage to the fuel injectors and other components. Really glad I got that second opinion here before proceeding with repairs. The detailed pressure testing confirmed the exact issue, making the fix straightforward and effective.