The torrid preseason continued for McLaren-Honda when the team had to cut short the first day of the final stanza of preseason testing in Barcelona, on Thursday, due to a hydraulic leak.
The team summed up their opening day, with Jenson Button at the wheel of the MP4-39, at Circuit de Catalunya, "The day kicked off with Jenson conducting some aerodynamic tests, which meant he only completed a single timed lap."
"After just seven laps, Jenson noted a vibration and brought the car back to the pits, where we discovered a hydraulic leak that required a full power-unit change. The time required to complete the change unfortunately meant that our running for the day was over before lunchtime."
This comes in the wake of a myriad of sensor problems in Jerez earlier in the month and more recently a faulty MGU-K seal in Barcelona last time out.
Thus the nightmare continues for the new partnership between Honda and McLaren, exacerbated by Fernando Alonso's high profile, and much discussed mysterious accident last week at the same venue.
A serious lack of mileage, with what is proving to be a troublesome power unit suggests, that the Woking team will travel to Melbourne for the season opening Australian Grand Prix well out of sorts and the prospect of yet another below par season is on the cards.