The "AUC" acronym stands for Automatische Umluft Control (Automatic Recirculation Control). In modern BMW M6 models, this sensor acts as a gateway for the IHKA (Integrated Automatic Heating and Air Conditioning) system.
Over time, the chemical sensing element inside the AUC sensor becomes "poisoned" or worn out, losing its ability to distinguish between clean air and exhaust fumes. M6 Auc 4s0101
: Often produced by HELLA (OEM) or directly as a genuine BMW part. The "AUC" acronym stands for Automatische Umluft Control
In the BMW M6 E63/E64 (and related 5-series E60 models), the sensor is typically located on the or near the microfilter housing in the engine bay. This allows it to sample ambient air before it reaches the vehicle's intake vents. Installation is generally straightforward, requiring only a simple "plug-and-play" connection to the existing harness. BMW M6 Coupe E63 5.0L V10 AUC Sensor : Often produced by HELLA (OEM) or directly
: To prevent the build-up of CO2 and humidity inside the car, the system is programmed with a timer. For instance, at external temperatures above 6°C, the system may recirculate air for four minutes before briefly opening for one minute to refresh the cabin air. Part Identification and Compatibility
: If you smell diesel or gasoline fumes inside your BMW M6 even when the AC is on, the sensor has likely failed.