PSG had been ordered to close two sections of their Parc des Princes stadium as punishment for their supporters' abuse of disabled Chelsea fans during their Champions League quarter-final match in April.
But European football's governing body said on Friday that their appeals body had partially upheld PSG's appeal and instead fined the club €50,000 ($64,790).
PSG will host Spanish giants Barcelona on September 30.
The club have also been ordered to make changes at their stadium "in order that people with reduced mobility are better protected," UEFA said in a statement.
During the April 2 first-leg quarter-final — in which PSG beat the Londoners 3-1 — a group of disabled Chelsea fans were seated among the home supporters due to a lack of facilities in the visitors' stands.
They were subjected to a hail of abuse, spat on, and pelted with plastic bottles.
Chelsea won the April 8 second leg at Stamford Bridge 2-0, ejecting PSG due to the away goals rule.