RS6 MAP Sensor Failure Causing Power Loss and High Fuel

Had similar symptoms on my 2019 S6. The intake manifold pressure sensor was showing incorrect readings, causing poor engine performance and increased fuel consumption. Diagnostic scan revealed a P0106 code related to the MAP sensor circuit. The root cause turned out to be a significant vacuum leak at the intake manifold gasket. After a thorough inspection, the technician found cracks in the manifold seal allowing unmetered air into the system. This affected the MAP sensor readings and threw off the entire fuel management. Replacing both the manifold sensor and gasket resolved all symptoms completely. Engine performance returned to normal with proper throttle response. This was a serious issue that needed immediate attention, as continued operation could have led to further engine management problems. Key diagnostic steps included: Smoke test to confirm vacuum leak, Testing MAP sensor voltage readings, Checking intake manifold for proper sealing, Verifying PCV system operation Suggest having a complete manifold pressure test done before just replacing the sensor. Often the sensor itself isnt faulty, but rather responding to an underlying vacuum leak issue.

Thanks for sharing your experience. Good to hear you got it sorted. This seems similar to what I am experiencing with my car. Did you recall what you paid for the full fix including parts and labor? Also wondering if youve had any recurring issues since the repair was done. The dealership quoted me quite high for just the MAP sensor replacement, so trying to get a sense of fair pricing.

Got my vehicle back from the repair shop last week. The issue was indeed similar, a faulty manifold pressure sensor combined with a large vacuum leakage needed fixing. The total repair cost came to 235 Euro, which included both parts and labor. This price turned out quite reasonable compared to the initial dealer quotes. Since completing the manifold sensor replacement and sealing the vacuum leak, engine performance has returned to normal. No recurring issues at all, fuel consumption is back to standard levels and the engine responds perfectly. The intake manifold pressure readings are now stable according to the post-repair diagnostic scan. The mechanic did a thorough job testing all connected components to ensure there were no related problems affecting the manifold pressure system. Their comprehensive approach to diagnosing and fixing both the sensor and the vacuum leak proved more cost-effective than just replacing parts without proper testing. If your symptoms match what I experienced, definitely have them check for vacuum leaks alongside any sensor replacement. The combined fix typically offers better long-term results for overall engine performance.

Thanks for the input. Just got back from my trusted independent mechanic who diagnosed and fixed the issue. The MAP sensor replacement alone didnt solve it, turned out I also had a significant vacuum leak that was throwing off the manifold pressure readings. Total cost came to 280 Euro for parts and labor, which included a new pressure sensor, gasket replacement, and complete system testing. Much better than the 450 Euro the dealer wanted just for the sensor replacement. The car runs perfectly now, fuel economy is back to normal and the sluggish response is completely gone. No more check engine light either. Really glad I had them do the full diagnostic rather than just swapping the sensor blindly. The manifold pressure test they performed caught the vacuum leak that was the root cause. Will definitely keep an eye on the readings through my scan tool for the next few weeks, but so far everything indicates this was a successful repair. The engine performance is back to what it should be for a car with this mileage.