Turbo control issues:
Check intake system and turbo vacuum system for leaks using a smoke machine. Check turbo control works.
That's your primary issue.
As for the glow plug relay signal, check glow plug relay and contacts for dirt and corrosion. Check glow plus for continuity, make sure all 5 are the same. This is a secondary issue that will impact cold starting and regeneration, but otherwise not on normal running.
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XC90 R-Design MY2009, Black Sapphire Metallic. HP-Sound, RSE, Nav, Tel, ParkingCam, BLIS, ParkingHeater, RestHeat, Removable Towbar, Summer: CRATUS 20x8 on Pirelli Scorpion Zeros 255/45, Winter: NEPTUNE 17x7 on Continental WinterContact 4x4 235/65.
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