I’ve owned Citroens for over 20 years and have reset the service light myself what model you got?
It’s a c5x, TBF 1st ever Citroën and been quite impressed. Had a few gremlins occasionally with infotainment stuff but nothing turning off and back on didn’t fix.
Biggest issue is bloody yanky voice and terms like highway instead of motorway and after 3 years have never received OTA update to get civilised voice and Citroën UK customer service is shocking.
Anyway, seen plenty of YouTube vids and websites with instructions to reset. Haven’t had chance to sort yet but looks simple enough.