Audi S5 Throttle Body Issues Causing Power Loss

As someone with moderate car repair experience, I dealt with a very similar issue on my 2011 Audi S4. The check engine light came on, and the throttle response became sluggish, eventually triggering limp mode. The throttle sensor was giving inconsistent readings, which turned out to be caused by a failing accelerator pedal module. After diagnosis, the workshop confirmed the throttle body itself was fine, but the electronic components in the pedal assembly were the root cause. The repair cost me 265 Euro, including parts and labor. The fix resolved both the check engine warning and restored normal throttle response. The fuel efficiency also returned to normal levels after the repair. To provide more specific advice about your S5, could you share: Current mileage, Any diagnostic codes pulled, Whether the issue occurs from cold start or only when warm, If you notice any specific timing of the power reduction, Whether the throttle response is consistently poor or intermittent These details would help determine if your issue matches what I experienced with the pedal module failure.

Thanks for sharing your experience. My Audi S5 has 9989 KM and last service was 2 months ago. After a scan, I found error code P2101 indicating issues with the throttle control system. The response delay happens mainly during acceleration, and the air intake system seems connected to the problem. The issue started intermittently but now occurs every time I drive. The throttle sensor readings are erratic according to my OBD readings. The replacement cost quoted by my mechanic is 450 Euro for the throttle body assembly. Before committing to the repair, I wanted to confirm if this matches others experiences with similar symptoms in limp mode.

Based on your error code P2101 and symptoms, my experience with the pedal module issue was different from what you are describing. The throttle body assembly replacement cost you were quoted at 450 Euro seems in line with typical market rates, and given the erratic sensor readings, this appears to be the correct diagnosis. When my S4 had issues, the response delay pattern was less consistent and would sometimes resolve after engine restart. Your constant symptoms and specific error code point more definitively to the throttle body being the culprit, unlike my pedal module situation. The poor engine idling and constant engagement of limp mode you describe match classic throttle body failure patterns. Since your car shows these symptoms consistently now, addressing it promptly would be wise to prevent further fuel efficiency issues and potential complete system failure. With low mileage like yours, you might want to check if this could be covered under any remaining warranty, though at 2 years old that might be unlikely. The repair should resolve both the check engine warning and restore proper throttle response. Have you noticed any unusual sounds from the throttle body area during engine idling? This could help confirm the diagnosis further.

Thanks for the input. After cross-referencing the error code P2101 with the symptoms and investigating costs, I have decided to proceed with the throttle body replacement. The consistent response delay and air intake issues match the diagnosis, and the 450 Euro quote seems reasonable based on shared experiences. The erratic throttle sensor readings and constant limp mode activation leave little doubt about the failing component. Since the problem affects daily drivability and engine idling performance, waiting longer could risk more expensive repairs down the line. Will schedule the repair next week and update once completed in case others experience similar check engine warnings or throttle response issues with their S5.