A broken spark plug was the "symptom, not the cause" of the problem aboard Sebastian Vettel’s Red Bull in Bahrain two weeks ago.
That is the information of a spokesman for the team’s engine supplier Renault, according to the Cologne publication Express.
Vettel, 22, said on Thursday that the problem had been traced to a broken tip at the top of a Champion spark plug fitted to his V8 engine.
But Renault’s engine technical boss Ron White also said the actual cause of the problem remains "a mystery".