Nick Heidfeld bounced back from a KERS problem to post the fourth quickest time on the final day of F1 testing in Barcelona.

The German was forced to miss much of the morning as the Lotus Renault GP team worked to resolve the problem before finally managing to hit the track before lunchtime to work on set-up.

Heidfeld then focused on the first race run of the new R31 during the afternoon and insisted the team had been able to gather a lot of data from running the car on a high fuel load, even if a number of red flags interrupted proceedings.

"In the morning we were not able to do most of our programme because we had an issue with the KERS," he said. "It's a shame because track time is so limited, but it's obviously better to have problems during testing before the season starts. In the afternoon we started the race simulation, which went reasonably well.

"We were using different tyre compounds and tried both scrubbed and new sets. We learned a lot by running the car on high fuel and have lots of useful data about the degradation rates. Then, at the end of the day, we returned to the set-up work."

To see times from the final day in Barcelona, CLICK HERE.

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