Renault say they have done their best to fix the engine problems that blighted last weekend’s Chinese Grand Prix but offered no guarantee yesterday that Sunday’s race in Bahrain would be trouble free.

“In the short time since the Chinese Grand Prix we have been checking and rechecking systems and procedures to implement fixes for the next race in Bahrain,” said Renault sport F1 managing director Cyril Abiteboul in a statement.

“Due to logistics of the back-to-back races a complete guarantee will be difficult but we have made improvements to prevent the race stoppers we saw in China. Our motivation is as high as ever.”

Former Formula One champions Red Bull scored just two points in Shanghai while their sister team Toro Rosso drew a blank after engine-related retirements.

Renault have been under fire from Red Bull this season, after a 2014 season dominated by Mercedes, but Abiteboul said Renault had made real progress in performance and driveability since the opening race in Australia.

“It’s frustrating that the reliability issues of Shanghai threw a cover over these,” he said.

“We don’t take the issues we have seen lightly, but we have taken genuine steps forward and need to focus on our continuing programme of impro-vements while addressing the reliability concerns in parallel.”