After a spate of one car starts, Fernando Alonso acknowledges that McLaren-Honda are having to prioritise reliability over performance at the moment.
While Alonso was the only McLaren driver to start the Chinese Grand Prix, in Sochi, it was his first to sit out a race as his MCL32 broke down on the formation lap.
McLaren's disappointing run, which has resulted in just two finishes in six starts, means Alonso heads to Spain uncertain as to what he can expect at his home race.
"After a run of difficult races for us, I’m not sure what we can expect from this weekend," he said.
"We're expecting some various new parts – which we bring to every race – but we can't really focus too much on performance until we have solved our reliability issues. That's always our focus.
"I know the team is working extremely hard to get to the bottom of our recent problems, and I am hopeful we can have a smooth race and a weekend with very few issues.
"For me, qualifying has been an exciting session in the past few races and I hope we can repeat that in Barcelona, but the most important thing will be to maximise whatever grid slot we achieve on Saturday, on race day."
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