Audi A5 MAF Sensor Failure Warning Signs & Symptoms

Had similar symptoms on an Audi A4 2016. The engine would stall at idle, and performance decline was noticeable, especially during acceleration. The check engine light triggered due to incorrect air-fuel mixture readings. Initially suspected a clogged air filter, but after inspection, the MAF sensor was the culprit. These symptoms are classic signs of a defective MAF sensor. The repair involved cleaning the sensor first, but it ultimately needed replacement because cleaning only provided temporary improvement. The job is straightforward for a qualified mechanic, takes about an hour for diagnostics and replacement. Its a serious issue that needs addressing quickly as it affects engine performance and can lead to catalytic converter damage if left unattended. While checking the MAF sensor, also worth inspecting the air filter and entire air intake system for any damage or blockages. In my case, the air filter was also quite dirty and needed replacement, though this was a separate maintenance item. Important to use OEM parts for MAF sensor replacement, aftermarket sensors can cause recurring issues with these engines.

Thanks for sharing your experience. I had the exact same mass air flow sensor failure on my A5 too a while back. Those symptoms you described match perfectly, the engine stalling, erratic idle, and that annoying check engine light. Good call about checking both the sensor and air filter. Do you remember roughly what you paid for the repair? Just curious if prices have changed much. Also, has everything been running smoothly since the fix, or have you noticed any other sensor-related issues popping up?

Yes, just had the mass air flow sensor replaced last week and the repair cost came to 365 Euro total. The fuel economy has improved significantly since fixing the sensor failure. The engine runs much smoother now, no more stalling at idle, and the check engine light has stayed off. The air intake system was thoroughly checked during the repair and everything else looked good, including the air filter. No other sensor-related issues have appeared since the fix. The mechanic confirmed the symptoms were typical of a faulty MAF sensor, and replacing it with an OEM part was definitely the right call. Worth mentioning that routine maintenance of the air intake components can help prevent premature MAF sensor failures. My car now performs like new, with proper acceleration response and stable idle.

Thanks for the input. Took my A5 to a specialist yesterday after reading these responses. Turns out it was definitely the MAF sensor. Total bill came to 395 Euro including parts and labor, which seems fair based on what others paid. The mechanic showed me the faulty sensor and explained how it was causing the engine stalling and poor performance. They also checked the air filter while they were at it, it was actually pretty clean, so that saved some money. Car runs perfectly now, no more stalling, better fuel consumption, and the check engine light is gone. The acceleration is way smoother too. Glad I got it sorted before it caused any bigger issues with the engine. Got them to install an OEM part as suggested. Really appreciate the heads up about avoiding aftermarket sensors, definitely worth spending a bit extra for the proper part.