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Outside Air Quality Function

D22New

New Member
We've had our Grand Scenic IV for 6 months now, but there's still some things I'm not sure about. I've looked in the instruction guide but can't find anything. My query is, with the Outside Air Quality Function on the multimedia screen, it gives a nice graphic to show if we're in polluted air. What device on the car is measuring this air quality and what aspect is it detecting that is identifying the air as polluted? NOx, CO2, PM2.5?
 
The "Air quality" sensor sits just inside the intake aperture of the main heater box under the dash board For Scenic IV.
There are no specific information listed for your Scenic on what pollutants it monitors, just that it senses the concentration of those pollutants and tells the climate control ECU to shut the control flap, so I can only assume it is the expected pollutants that are present during traffic.
The sensor on older generation vehicles, after a while use to get contaminated due to aging and had to be replaced, but I haven't had to do that on recent models which is a blessing at present but like any sensor they do have a life span which is only known once it has failed.
 
The universe does strange things in life, and it just happens that one my diagnostic jobs this morning before a long drive up to Doncaster was to check a "malfunctioning " HVAC on year old Austral.
So once the reported problem was sorted, I generated a Air quality sensor fault to see what it says and in the description it had the following, but I have to say this is a new gen vehicle so things may be slightly different but the basics will be the same.


The Toxicity sensor is part of the air conditioning system. It measures pollutants, in the form of oxidisable or reducible gases, in the air outside your car. gases include carbon monoxide, hydrocarbons (vapours from benzene or petrol) and other partially burnt fuel components.
If the quality of the outside air drops, the control system activates the Climatronic air recirculation mode, stopping polluted air from coming in and maintaining the quality of air inside the car.
signal is activated through a change in the impedance of a metal layer triggered by the absorption of reducing (CO) and oxidizing (Nox) gases The measuring range is From 5 to 200 ppm for CO and From 0,1 to 5 ppm for Nox
 
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