Christian Horner has detailed the close shave Red Bull encountered with Max Verstappen’s engine before his brilliant Hungarian Grand Prix victory.

The anxiety began for the World Champion when he suffered a power-unit issue during the last part of qualifying, which meant he was unable to set a truly representative Q3 time following a mistake on the first of his two runs.

Red Bull were able to change Verstappen’s power unit, and that of his team-mate Sergio Perez, on the morning of the race and still keep their grid positions of 10th and 11th respectively due to a rule change agreed in June.

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