Sauber rookie Sergio Perez was forced to retire from the Malaysian Grand Prix after running over debris from another car.
The Mexican was following Sebastian Buemi's Toro Rosso in 14th position when he pulled off the track on lap 25 after his Ferrari engine switched off.
"Something came out of the car of Buemi and hit the ground of my car," Perez said. "Then I lost the power. We have to now analyze and see what really happened."
Perez, who starred on his Formula 1 debut two weeks ago in Australia finishing seventh on the road before Sauber was disqualified from the results because of a rear wing infringement, said had he continued he wouldn't have expected to produce a similar performance in Malaysia.
"We got the pit strategy wrong. I stopped too late for the ideal position on the racetrack, so because of that my race was not going very well," he explained.