Look carefully at the intake system for air leaks, especially from Turbo to the intercooler
Split pipe, cracks, failed seals, etc.
May also be a leaking intercooler.
Any leaks past the MAF result in too rich a mixture due to too much unmetered air.
if you have a split pipe or a crack, you can make a temporary repair with some duct tape.... but make sure you replace any broken part you find.
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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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