Jean-Eric Vergne has been given a 10-place grid penalty for the Spanish Grand Prix after his Toro Rosso lost a wheel in final practice.
The team has also been given a €30,000 fine, as the stewards ruled that Vergne's car had been released from the pits in an unsafe condition.
Toro Rosso's head of vehicle performance Laurent Mekies said prior to the announcement of the fine that the team was investigating what had gone wrong.
"Overall, until five minutes to go, it was going quite well today," he said.
"Unfortunately we had an issue with JEV's pitstop at the end of his long run, when we lost a wheel as soon as he left the pitlane, but luckily no one was injured.
"We have to understand exactly what went wrong and make sure we can correct that for tomorrow."