Sebastian Vettel says his failure on the formation lap of the Bahrain Grand Prix caught him by surprise, as he was unable to start the second round of the season.
Vettel was set to line up from third place on the grid but smoke trailed from his SF16-H and he was prevented from taking the start.
It was the first time in his Formula 1 career that Vettel had been unable to start a Grand Prix.
"It was a very short race today, I didn't even break a drop of sweat," he said.
"We had a failure, I saw a lot of smoke from behind and I lost power so we decided to stop the car. For sure it is frustrating, because in the end I am here to race.
"The problem came as a surprise, both for me and the whole team, as I was approaching Turn 11.
"Now we need to understand exactly the problem and learn from it. It is not ideal and we can't be proud of it.
"But we had a good preparation over the winter, we are pushing very hard and we know that we can still improve."