Honda will introduce a modified MGU-H and turbocharger for both Toro Rosso drivers at this weekend's Bahrain Grand Prix.
Gasly suffered a retirement in the opening race of the season when his Honda power unit encountered an issue.
Toyoharu Tanabe, Honda's technical director, revealed that this was caused by an issue with the MGU-H and turbo, both of which have now been modified as a result.
Gasly will get a new Internal Combustion Engine (ICE) as well as the modified parts due to the damage caused to his engine.
Drivers are limited to a combination of two and three power unit components, meaning Gasly is now closer to a potential grid penalty, should the replaced parts be deemed to be irreparable.
"During the race in Australia, we had an issue with the MGU-H and turbocharger on Pierre’s car and this had the knock-on effect of also damaging the ICE.
"Therefore, in Bahrain, Pierre will use a new ICE, MGU-H and turbocharger. The MGU-H and turbo have both been modified, in light of what we learned in the first race," explained Tanabe.
Hartley will also receive the modified components as a "precautionary measure" to avoid a repeat of the problem that struck his team-mate in Australia.
"Given the problems we encountered in Melbourne, we have decided, as a precautionary measure, to also change the MGU-H and turbocharger on Brendon’s car, fitting the new modified components.
"Replacing components for the second race is obviously a difficult decision and not ideal, given that the number of Power Units and ancillary components is now limited to just three per season, however we believe this is the right way forward and we will continue our development in order to ensure the same issue does not reoccur.
"Although Sakhir is a tough track for the PU, we hope to move on from this difficult moment, as we focus on this race and those that follow."
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