More woe for Woking-based team
The McLaren team has been forced to end the first of the final test at Barcelona early following more mechanical problems.
Jenson Button managed just seven laps in the morning session, only one of them timed, after a hydraulic leak.
The Briton was nearly seven seconds off the pace.
The Honda-powered team said after the lunch break that it will not be able to continue running today as it need to replace the engine.