Sauber have revealed at the fire that caused havoc to their car at Mugello on Thursday was the result of "heat shield in the exhaust area" catching fire.
Sergio Perez's running at the Italian circuit began in dramatic fashion on Thursday when he pulled into the pits with thick smoking pouring from the engine bay.
The Mexican's team were quick to put out the fire with Perez going on to complete over 100 laps and finishing the day with the fifth fastest lap time.
Sauber have downplayed the blaze, insisting that it nothing to be worried about.
"It was just a heat shield in the exhaust area that had caught fire and was obviously replaced," a team spokesperson told GPUpdate.net.