Open windows! CO² concentration too high

A red open windows! CO² concentration too high light means you should stop the car as soon as it's safe

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CO² concentration in the vehicle interior air too high

The indicator lamp lights up red or yellow.

The message Health risk! High CO² concentration. Open windows! or Health risk! CO² too high. Open all windows immediately! maybe displayed on the instrument cluster display.

Open all windows immediately.
Go to a qualified workshop and have the system checked.

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