RS7 Stalling After Fuel Service Points to Air-Fuel Mix

After seeing similar symptoms on my 2018 RS5, it turned out to be a faulty connection at the fuel pressure sensor. The issue appeared after routine maintenance where the fuel filter was replaced. The engine would run with a rough idle and occasionally stall due to incorrect fuel mixture readings. The main symptoms were: Engine stalling at idle, Multiple error codes, Inconsistent engine performance, Poor fuel economy The root cause was a damaged wire harness connector at the fuel pressure sensor. During the fuel system service, the connector had been improperly reseated, causing intermittent signal issues. The sensor needs careful handling when accessing the fuel filter area. This was a serious issue that required immediate attention because incorrect fuel mixture can lead to engine knock and potential engine damage if left unaddressed. The repair involved replacing the damaged connector and properly securing all fuel system connections. Worth checking the connection points around any components that were accessed during your recent service. A proper diagnostic scan should point to specific sensor communication errors.

Thanks for sharing your experience with the RS5. Your symptoms sound exactly like what I went through with my RS7 last month. The stalling and rough idle were really concerning, especially since premium fuel quality is crucial for these engines. I am wondering how much the repair ended up costing you? My mechanic suggested it might be related to fuel additives they used during the service causing issues with the sensors. Would be helpful to know if you had any recurring problems after the fix. The fuel system in these cars is quite sensitive, and I am trying to decide if I should take it back to the same shop or find someone who specializes in Audi fuel delivery systems.

Your symptoms definitely matched mine, glad you mentioned it. The fuel pressure sensor issue was resolved about 3 months ago, and the fix has been solid with no recurring problems. The incorrect fuel composition readings were causing the ECU to make poor adjustments in the combustion chamber. The repair came to 95 Euro for fixing the cable connection. Pretty reasonable considering how the faulty connection was causing those serious fuel system issues. The fix was straightforward once they identified the root cause. Getting it checked by someone familiar with these high-performance fuel systems is crucial. Any shop doing the work needs to understand how sensitive the fuel pressure monitoring setup is. When they disconnect these components for service, proper reseating of all connections is essential to prevent false readings. Since the repair, my car runs perfectly with no stalling or rough idle. The engine management system now gets accurate fuel pressure data, so no more incorrect fuel mixture problems.

After reading about the RS5 experience, I finally got my RS7 sorted out. Took it to a different specialist shop that actually found the exact same issue, a damaged connector at the fuel pressure sensor. The previous shop must have mishandled it during the fuel system service. The repair cost me 120 Euro, which included a full diagnostic scan and fixing the wiring harness connection. The mechanic showed me how the connector was improperly seated, causing the fuel mixture to run rich in the combustion chamber. The car runs perfectly now, no more stalling, no engine knock, and all error codes are gone. Really glad I got a second opinion instead of letting the original shop keep guessing. The new mechanic also cleaned the fuel system without using aggressive fuel additives that could cause sensor issues. Looking back, the rough idle and stalling were scary, but at least it was a straightforward fix once properly diagnosed. My advice to anyone with similar symptoms: check those sensor connections first, especially after any fuel system work.