Da Costa had taken his first win of the season during the inaugural Misano E-Prix, but post-race checks mean the Porsche driver has been disqualified from the race result.
An FIA statement read: "At post-race scrutineering the Throttle Damper Spring mounted in car 13 during the race was not found in conformity with one of the three optional items declared in the GEN3 Spark Catalogue.
