What Causes the Failure of Audi Air Quality Sensor?
2 Answers
Audi air quality sensor failure is caused by component damage. Introduction to Air Quality Sensor: It is a type of automotive comfort system configuration that can detect the pollution level of the air on the road. When air pollution is severe, it automatically closes the external circulation to prevent harmful gases from entering the vehicle, ensuring a comfortable environment inside. When the air is clean, it automatically opens the external circulation to provide sufficient fresh air inside the vehicle. Automatic Air Quality Monitoring Operation Mode: It requires repeatedly pressing the internal circulation button until the indicator light on the lower right side of the button lights up, indicating that it is activated. This essentially means the vehicle's air automatically circulates, eliminating the need for repeated manual adjustments, making it convenient and practical.
I've given this some serious thought - when Audi's air quality sensor acts up, it's most likely due to clogged probes. Think about it: that detection port behind the front grille is constantly inhaling exhaust fumes and dust. When PM2.5 levels spike, the sensor becomes the first victim. Last month while helping a neighbor with their car, I disassembled it and found the sensor filter mesh clogged like a range hood filter. After blasting it with compressed air, it worked perfectly again. Another possibility is modification-related issues - I've seen cases where PPF installations accidentally sealed the sensor vents, or high-pressure car wash jets damaging circuit boards. If there's an error code but the detection port is clean, suspect rodent damage to wiring harnesses - modern vehicle wiring uses soybean oil-based insulation that mice absolutely love to chew. My advice? First locate the sensor using the manual and attempt cleaning. If that doesn't work, then head to the dealership for voltage signal testing.
