A8 TDI Power Loss: Throttle Sensor Warning Signs

Having worked on cars as a hobby for several years, I encountered a similar issue with my 2015 Audi A6 TDI. The symptoms matched exactly what you describe, the response delay when pressing the accelerator and sudden power loss, along with check engine light activation. After initial troubleshooting, my workshop diagnosed a faulty accelerator pedal module. The electronics inside the module were deteriorating, causing inconsistent signals to the engine management system. This triggered the engine to enter limp mode as a safety measure. The repair involved replacing the complete pedal module assembly. Total cost was 265 Euro including diagnostic work and installation. Since the replacement, engine idling returned to normal and the acceleration response improved immediately. To provide more specific guidance for your case, could you share: Current mileage on your A8, Whether there are any other warning lights, If the issue occurs more frequently when the engine is cold or warm, If you notice any unusual engine idling behavior, Whether you have access to diagnostic scan tool readings These details would help compare if your situation matches what I experienced and could point to whether you are facing the same accelerator module issue.

Mileage is 195601 KM. Last service done 2 months ago. The air intake issues seem very similar to what happened on my car. My check engine light started blinking last week when throttle sensor problems began occurring. The workshop ran diagnostics and found air flow restrictions in the intake system. The engine idling became rough and inconsistent. After cleaning the throttle body and replacing the air filter, performance improved slightly but the car still occasionally goes into limp mode. The mechanic suggested the mass air flow sensor might need replacement too. I will update once I get the final diagnosis. For now, I am avoiding highway driving until this is resolved.

Thanks for the additional details. Given the high mileage and symptoms you describe, my experience suggests you may be dealing with a combination of issues rather than just one faulty component. When my A6 showed similar symptoms, cleaning the throttle body provided only temporary improvement. The real breakthrough came after replacing both the mass air flow sensor and throttle body assembly. The total repair cost was around 850 Euro, but it completely resolved the limp mode episodes and restored proper engine idling. The blinking check engine light typically indicates a more serious condition than what I initially experienced with just the pedal module. Air flow restrictions can cause the engine management system to receive conflicting signals, leading to the response delay and reduced power you mentioned. Since your initial throttle body cleaning only brought partial improvement, this matches the pattern I encountered. My suggestion would be to have the workshop perform a thorough test of both the mass air flow sensor and throttle valve operation. In my case, waiting too long led to additional sensor failures due to the irregular air flow. Would you mind sharing the specific error codes from the diagnostic scan? This could help confirm if your situation is following the same pattern as my repair case.

The mechanic confirmed that multiple sensors needed attention. The error codes pointed to both throttle sensor and mass air flow issues, matching what you experienced. The scan showed P0101 and P2135 codes. After replacing the mass air flow sensor and cleaning the throttle body thoroughly, fuel efficiency has improved considerably. The check engine light is now off and engine idling returned to normal. The air intake system seems to be working properly again with no more power loss incidents. Total repair cost came to 780 Euro which included parts and labor. While expensive, it was worth fixing before more serious problems developed. The car now responds smoothly to acceleration with no delay, and performance is back to expected levels. For anyone else experiencing similar symptoms, a comprehensive diagnostic scan proved essential in identifying the root causes. Regular maintenance of the air intake system could help prevent these issues from developing.