Crash Landing
As advertised, the Protheans’ Conduit relay sends Shepard’s crew on a blistering FTL trip to the Citadel. The Mako reappears at the Presidium, emerging out of the mass relay "sculpture" that stands near the Citadel Tower elevator.
So that’s what that thing was for! A pair of geth troopers are crushed by the tumbling Mako, and the crew scrambles out of the wreckage.
Speak with the nearby Avina terminal; it’s gone completely haywire, but gives a bit of useful information pertaining to the whereabouts of Saren and the Council.
Approach the tower elevator instead, dropping the three husks that lower from nearby spikes to assault your team.
After they’re destroyed, board the elevator and begin the ascent to the Citadel Tower.