Audi S6 MAF Sensor Causing Stalls and Heavy Fuel Use

Having encountered similar symptoms on my 2009 Audi S4, I can confirm these signs strongly point to MAF sensor failure. The excessive fuel consumption combined with stalling issues matches exactly what I experienced. The smoke during acceleration occurs because a faulty mass air flow sensor sends incorrect data to the engine computer, causing improper air-fuel mixture. This explains both the poor fuel economy and the visible exhaust smoke. When my MAF sensor failed, the air intake system was unable to properly measure incoming air, leading to similar stalling issues. The check engine light is a typical indicator of sensor-related problems. The repair needed three main steps: Diagnostic testing to confirm MAF sensor failure, Cleaning the air intake system, Installing a new MAF sensor assembly This was a significant repair that required attention from a specialist familiar with Audi fuel management systems. Delaying the fix risks damage to other engine components due to incorrect fuel mixture. The most reliable solution is replacing the entire MAF sensor unit rather than attempting cleaning or partial repairs. This ensures proper air flow measurement and restores normal engine operation.

Thanks for the detailed breakdown of the MAF sensor issue. Your diagnosis matches my symptoms perfectly, especially the performance decline and stalling problems. I really should get this fixed soon to avoid more engine trouble. Had you noticed any other sensor failures popping up after fixing the mass air flow sensor? Also wondering what the total repair cost was in your case. Trying to budget for this and hoping to avoid any surprise expenses.

After getting the mass air flow sensor replaced by a qualified technician last month, my Audi S4 runs perfectly again. The engine stalling completely stopped and fuel economy returned to normal levels. The total repair came to 365 Euro, which covered diagnostics, parts, and labor. This was money well spent considering how the faulty sensor was affecting overall engine performance. No other sensor failures have occurred since fixing the mass air flow meter. The air intake system is working as intended, and the engine computer receives accurate readings. The smoke issue during acceleration also disappeared completely, confirming the MAF sensor was indeed the root cause. Worth mentioning that a properly functioning air filter helps prevent future MAF sensor issues. Regular maintenance of the air intake components can help avoid similar problems down the road.

Thanks for the input. Finally got my Audi fixed last week and wanted to share the outcome. Took it to a specialized shop that actually knew what they were doing. The mechanic confirmed the MAF sensor failure right away after running diagnostics. The air-fuel ratio was completely off, which explained all my problems. The repair cost me 390 Euro total. They replaced the sensor and cleaned the entire air intake system. No more stalling, no more smoke, and my fuel consumption is back to normal. The check engine light disappeared too. The mechanic also installed a new air filter since the old one was pretty dirty. Said it would help protect the new sensor. Been driving for a week now and the performance decline is completely gone, car runs like new again. Definitely glad I got this fixed before it caused more engine problems. The whole repair took about 3 hours and was worth every cent.