Honda says it will be bringing updates to its power unit at the Spanish Grand Prix in a bid to improve McLaren's driveability and reliability following a disappointing start to the 2015 F1 season.

With the all-new Honda power unit considered to be the root of McLaren's disproportionate number of technical issues so far this year, the Japanese firm has been under pressure to bring new updates in time for the Spanish Grand Prix.

Subsequently, Honda chief officer of motorsport Yasuhisa Arai is excited to see what his team have been able to produce during the break and is confident of another step forward.

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The short break before the Spanish GP has been good for Honda, to calmly reflect on what has happened in the first four races, to analyse what we have done well or not so well, and to make preparations ahead of the European races.

"We hope that Spain will see another incremental step forward for Honda, in which we've prepared updates on the power unit to help with driveability and reliability. And like us, McLaren has had a productive two weeks and will be bringing more updates to test at the track and we'll see how the car will run together as one.

"We're confident that every step we take together as a team is in the right direction, and hopefully this weekend will once again prove our continuing progress."