Peugeout 307 syst antipole defender failure

If anyone knows the source and solution of the problem, can it help please?

First, look at the malfunction codes, hodja. it becomes clear why he did it. According to him, let us help you for the solution. You have written on a similar subject, there are things that happen to friends and there are solutions.

It gives p0420 as the fault code, that is, low efficiency in the catalyst system