Audi S7 Manifold Sensor Causing Major Power Loss

Had nearly identical symptoms on my 2018 Audi S5 last month. The main automotive sensor monitoring the manifold absolute pressure was failing, causing poor engine performance and high fuel consumption. Initial diagnosis showed a significant vacuum leak at the intake manifold gasket. The car sensors were sending incorrect readings to the ECU, which explained the power loss and inefficient fuel mixture. The manifold sensor replacement alone did not solve the issue, the entire intake manifold gasket needed replacement due to deterioration. This is considered a serious repair since it affects core engine operation and fuel efficiency. Left untreated, it can lead to long-term engine damage and even more costly repairs. The job requires removing several components to access the intake manifold area properly. In my case, the repair included: New MAP (Manifold Absolute Pressure) sensor, Complete intake manifold gasket set, Vacuum line inspection and replacement, ECU recalibration The repair took about 6 hours in total. Would recommend finding a certified Audi specialist rather than a general mechanic, as proper diagnostic equipment is essential for accurate sensor calibration.

Thanks for sharing your experience. Your symptoms match exactly what I am dealing with. I am planning to take my S7 to a specialist this week for the manifold pressure sensor check and possible replacement. Quick question, do you remember roughly what the total repair cost was for the MAP sensor and gasket work? Also, has everything been running smoothly since the fix, or have you noticed any other issues pop up?

After getting my MAP sensor and vacuum leak fixed by the specialist, the car runs perfectly now. The faulty manifold pressure sensor was indeed the root cause, along with the vacuum leakage they discovered during inspection. Total repair cost came to 235 Euro, which covered both the automotive sensor replacement and fixing the significant vacuum leak. Since the repair three weeks ago, fuel consumption is back to normal and engine performance has completely recovered. No check engine lights or other issues have appeared. The sluggish acceleration is gone, and throttle response feels crisp again, just like when the car was newer. Going to a specialist was definitely worth it, they had the right diagnostic tools to properly calibrate the new manifold sensor. If your symptoms match what I experienced, you are likely dealing with the same problem. Getting it fixed sooner rather than later is important to prevent any potential engine damage from incorrect fuel mixtures.

Thanks for the input. I took my S7 to a certified specialist yesterday after reading about similar MAP sensor problems here. The diagnosis confirmed exactly what was discussed, failed manifold pressure sensor and vacuum leak issues. Total repair bill came to 290 Euro for replacing the MAP sensor, fixing the vacuum leak, and recalibrating everything. More than expected but worth every cent. The specialist was thorough and explained all the sensor failure symptoms I had been experiencing. Took it for a test drive after the repair and what a difference. Engine performance is completely restored, acceleration is responsive again, and the check engine light is finally off. Fuel consumption has already dropped noticeably on the drive home. Really glad I switched to a proper specialist for this repair. Their diagnostic equipment picked up issues my regular mechanic missed. The manifold sensor replacement was definitely the right fix, feels like driving a different car now.