Marussia will definitely join the Formula 1 test at Jerez in Spain later this week after the car was dispatched from the factory on Tuesday.
The Banbury-based outfit had originally hoped to be able to join running from today, but a last-minute technical glitch came to light during the final build preparations.
The team decided that it was better to solve the problem back at its base, rather than send the car to Spain and deal with it there.
Following intense efforts over the past 48 hours, the unspecified technical problem has been sorted and the MR03 has now been sent to Jerez.
The journey from Banbury to Jerez means the car is unlikely to arrive before Wednesday, but that should still give Marussia enough time to be able to join the test as early as Thursday.