All four of the Renualt-supplied teams, including reigning world constructors' champions Red Bull, have endured considerable difficulties in the first two pre-season tests in Jerez and Bahrain.
Red Bull have been plagued by reliability concerns, while Lotus, Toro Rosso and Caterham have also been troubled by the issues with Renault's engine.
But, ahead of Thursday's final test in Bahrain, the company's head of track operations Remi Taffin has faith that the worst of
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