MONTMELO, Spain (AP) — Red Bull has changed the chassis on Sebastian Vettel's car in a move the struggling four-time Formula One champion calls a "sanity check."
With Vettel's dominance of F1 in jeopardy, Red Bull replaced the chassis with an old one he used during preseason testing, before starting practice at the Spanish Grand Prix this week.
"It's more a sanity check rather than a real problem with the other chassis," Vettel said. "So it's just to try everything we can, and basically reset and start again."
Vettel enters Sunday's race in fifth place in the standings with 33 points, far from Mercedes driver Nico Rosberg's competition-leading 79.
The massive rule book overhaul and the switch to V6 turbo hybrid engines this offseason has dislodged Vettel as the perennial favorite.
He has only one podium finish through four races, marking his worst start since joining Red Bull. His troubles have even led his team to order Vettel to let new teammate Daniel Ricciardo pass him in the last two races.
Vettel defended Red Bull's engine-provider, Renault, saying both team and motor-maker needed to share the burden of improving the car and increasing its speed in straightaways.
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