Hi,

I have a fault code 912749 but I can't identify the right sensor (look at the picture).
The description in French is saying "Air Quality Sensor" and it is shown in the A/C section.
As of my knowledge, there is no Air Quality Sensor in a car. I know inside / outside Air temperature, Air pressure etc. but no Air Quality Sensor.

Anyone has an idea of this fault code ?

Thanks.

file:  IMG_20150608_095515.jpg

 OK, there IS an Air Quality sensor that is used to toggle air recycling when outside air quality is healthy enough.

Will have to look for it in Mercedes EPC.