Peugeot 2008 engine fault, needs repair warning light.

I had the engine light coming on in my diesel 2016 allure, I do very low miles these days and was told the cat probably needed a clean out because of the soot building up.
I put a shot of Redex particulate filter cleaner into a full tank of diesel and took it for a drive, in less than ten minutes the light went out.
I now put a shot in every third tankful and it works for me!
Hope this helps.