Ferrari is investigating the electrical issue that caused Sebastian Vettel's Friday practice at the Russian Grand Prix to be cut short.
Vettel's car stopped on track midway through his qualifying simulation and had to be wheeled back to the pits, resulting in him missing half of the session. Vettel confirmed it was an electrical issue, but said the team still needs to understand the problem in full.
"Yeah we had an electrical problem, obviously that's part of the electrical bits on the car," he said. "We don't know yet entirely but we have to see, I'm sure we can fix it but first of all we have to understand what happened.
"It's a bit of a shame because we are lacking a couple of laps -- especially in the long run and race trim -- to see how competitive we are. But I think Kimi did homework for the team so not too bad. I think also here we know roughly what to expect so I think we can still learn a lot from what other people did."
Vettel ran Ferrari's engine upgrade during the session, but said it was difficult to notice a big difference from behind the wheel.
"The feeling was alright, the balance wasn't yet where I want it to be but I think we can improve. Naturally I think the circuit should come our way. It was quite slippery this morning, I spun on the first two laps but I didn't spin this afternoon so that's already a massive improvement! I think we go from there. Obviously we are lacking a bit of information now on my side for the long run but I think other people did the homework and we can hopefully copy a bit."