Mark Webber had another KERS power-boost issue in today’s practice session ahead of Sunday’s Abu Dhabi grand prix.
In the morning session McLaren’s Lewis Hamilton set the quickest time with a lap of the Yas Marina circuit in 1 minute 43.285 seconds.
But in the afternoon Webber’s Red Bull teammate Sebastian Vettel was fastest – finishing 0.168 seconds quicker than Hamilton.
McLaren’s Jenson Button finished with the third quickest time.
Webber, of Aston Clinton, ended the morning session with the fifth quickest time and the afternoon with the fourth.
Last weekend in India, he blamed a KERS power-boost issue for finishing third after starting the race in second.
Today, Webber said: “We had a KERS issue, which wasn’t the same as last week.
“It never a helps to miss some running on the track during practice, but it’s not a big deal.
“The track will move around a little bit from where it is now, but not a huge amount.
“It’s in pretty good shape straightaway.
“We’ll get it fixed tonight and come back tomorrow.”
Webber’s teammate Vettel said: “I think we can be happy with today.
“Overall we got a good lap on the soft tyres, but in general pace the McLaren’s were quick and seem competitive, so they’re the ones we need to look out for and beat.
“We need to improve the car overnight to qualify as high as we can tomorrow.”
Elsewhere Romain Grosjean and Kimi Raikkonen, of Lotus, finished in fifth and sixth in the afternoon session.
Ferrari’s Fernando Alonso was behind them, followed by his team mate Felipe Massa.
Pastor Maldonado, of Williams, and Sergio Perez, of Sauber, rounded off the top 10. Afterwards Perez said: “For me it was a good day.
“We have completed our entire planned programme, so in this respect it was very positive.
“I am comfortable with the balance of the car and, therefore, I think my position in the second session is pretty much what we are capable of here. This means Q3 is possible.”
Michael Schumacher, who finished the morning in sixth and afternoon in 14th, said: “Today we saw what I would call a ‘normal’ Friday - doing certain programmes, changing the set-up and typical data collection work.
“What we saw at the end of the day is probably where we are, so a pretty realistic picture.
“At the moment we are driving to finish in the points, and that is what we will target for the weekend.
“On a different note, it really is impressive and beautiful to drive here, and to drive from daytime into the night really is special.”