Seats and toilets in the away section were vandalised while some spectators were seen throwing objects and letting off flares during the match on November 7, which ended 3-0 to City. Young Boys will also be banned from selling European tickets for one away game should fans break a two-year probation period.
The Bern-based outfit have 30 days in which to agree a settlement fee with City over damages made to the stadium on the night. Young Boys were fined just over 20,000 alone for the lighting of fireworks. The rest of the total fine was due to the throwing of objects and acts of damage as well as other crowd disturbances.
The win for City saw them qualify for the Champions League knockouts with two matchdays to spare, having beaten Young Boys 3-1 in the reverse group stage fixture. A brace from Erling Haaland and a goal from Phil Foden saw the defending champions comfortably over the line at the Etihad a fortnight ago.
City host RB Leipzig on Tuesday, November 28 before concluding the group stage on December 13 against Red Star Belgrade. A result against Leipzig would secure top spot for City, placing them in pot one for the last-16 draw which takes place on December 18 in Nyon, Switzerland.