Refrigerant R1234YF Combustibility/Decomposition

WARNING: This page is about a different car, the 2021 Audi e-tron Quattro and 2019 Audi e-tron Quattro. However, it is still accessible from the selected car via links, so may be relevant.

The refrigerant R1234yf is combustible in a specified concentration in the surrounding air.
The refrigerant R1234yf breaks down when exposed to flames and glowing or hot surfaces. UV light also causes refrigerant decomposition (UV light is a component of normal sunlight, it is also created for example by electric welding) the resulting decomposition products are toxic and must not be inhaled. However, irritation of the mucous membranes provides an adequate and timely warning.
During decomposition specific dangerous products such as carbon monoxide, hydrogen fluoride and/or hydrocarbons can be created.