Antiair Pollution fault

Hello, I have been using my 307 XR BVA vehicle since February 2009. Since the weather has started to cool down, my vehicle's malfunction lamp comes on and it gives "antiair pollution fault" and "catalitic convertor fault" errors in order. When I start the car for the first time, the fault lamp lights up when the car moves without warming up. The fault lamp goes out when the vehicle gets hot and the ignition on and off. What could be the source of this problem? Thanks in advance ...

Have the oxygen sensors checked. Parts 1 and 1 in the picture.