Honda has been forced into making component changes to the engines of both Toro Rosso cars ahead of the Bahrain Grand Prix.
Toro Rosso suffered a mechanical problem in its debut race with Honda, the Australian Grand Prix, with Pierre Gasly retiring after just 13 laps due to an issue with the engine's MGU-H and turbocharger. Those components have been replaced on the Frenchman's car, as has the internal combustion engine (ICE), which was also damaged. As a precaution, the modified MGU-H and turbocharger have been fitted to the car of Brendon Hartley.
F1 controversially tweaked its engine regulations for 2018, limiting drivers to a maximum of three engines, MGU-Hs and turbochargers across 21 races, and just two MGU-Ks, energy stores and controlled electronic components.