New to the forum so Hi,

Was after some advice, recently had our 1 series engine carbon cleaned, itís done 76,000 so thought may benefit it,
Before and after they run a diagnostic and it threw up 3 codes

30E9-dme cat converter ageing
30EA-dme cat converter sulphurised
2f11- radiator blind top

It did also throw up misfire on cylinder 3 which was historic.

Iíve read a few posts saying this is possibly a NOx sensor replacement?
It turns over quite a few times on start up when cold and thereís is a hesitation / stutter in gears 1 and 2 just below 2000rpm
Had the spark plugs replaced last year as well as the coil packs checked.

Any advice would be appreciated.