Testing E46 AUC sensor with INPA

Most E46, E39, E53 and newer BMWs have an AUC sensor that detects pollutants in the air and auto recirculates the interior air. This is how I observe if the sensor is working.

[@SamBao]

I'm actually retrofitting this on my E90, would be a great way to test if the sensor is working!

[@sirmo667]

When this sensor goes out will it completely shut off the AC button functions? My screen won’t show any values and buttons don’t work in my 2002 E39 M5

[@TheBabbitt]

No, if this sensor will go out everything will pretty much function normally. You need to us INPA or ISTA to see the code and know it is failing. If it fails it simply won’t automatically turn on the air recirculating when there are unburnt hydrocarbons in the air.

[@sirmo667]

@@TheBabbitt Thanks! I have a different code for heater and inductive transmitter. Is there a site I can use to see what the error codes mean?