2006 307SW 1.6 Petrol - Engine cutting out at idle

[vaultsman]

My daughter's having an intermittent problem again with her car - very similar to problems she had a year ago.

Faltering then cutting out at idle, depollution warning and EML on.

Diagbox codes:

Clear the faults and it's OK for a while, then the issue returns.

I replaced the crankshaft position sensor in April last year, non-OEM so I'm wondering whether this might be suspect.
Also replaced the coil pack last September.

Any help appreciated!