Renault have some hard grafting ahead after deputy managing director Rob White admitted they faced a "litany of issues" at Jerez.
Renault had a dismal start to pre-season testing with their new V6 engine and its cooling system, gaining the least mileage of the three engine suppliers.
While Mercedes managed 3874kms over the four days, Ferrari did 1966 and Renault just 668.
And the team worst hit by the problems was reigning World Champions Red Bull Racing who covered just 21 laps, 92kms.
"We have not run enough laps, and when we have they have not been run at an acceptable performance level," said White.
"The underlying causes are not straightforward: there isn't a...
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