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Vettel’s run on day two was cut short when engine-maker Renault reported a malfunction. The Austrian team said “similar issues” still plagued their new vehicle.

“The measures we took only partially solved the issue,” Red Bull engineer Andy Damerum said. “And, as with yesterday, it’s more sensible to stop and dig deeper into finding a solution. It’s obviously not where we want to be and naturally the whole team is frustrated.”

All teams are struggling to get their cars ready after F1 made a sweeping revision of the rulebook that included a shift to a turbo engine and integrating more sophisticated energy recovery systems.

But, so far, traditional contenders Ferrari, Mercedes, and McLaren are dealing better with the new regulations than the titleholder.

After testing in southern Spain, two more tests follow in Bahrain.