Christian Horner has singled out reliability as "the number 1 challenge" for the start of the 2014 season.
The Red Bull boss has admitted that even the world champion team, having won the last four double world championships on the trot, will have "several sleepless nights" ahead of the start of winter testing late this month.
Horner said it will be a "hugely busy winter" as teams prepare for the radical new regulations, including the new turbo V6 power unit.
"As you know," he told Finland's Turun Sanomat newspaper, "Adrian Newey does not have a reputation for having a car ready ahead of time, so I am sure there will be several sleepless nights...
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