Before you do any big work, take off the rubber air intake pipe to the inlet manifold and look inside the pipework.
The rubber pipe is easy and non-destructive to remove.
No damage to anything, no new gaskets needed.
OK, it might be a bit tight and a bit stuck, but still the easiest thing to remove.
If the pipework looks pretty good with minimal deposits, then don't touch anything. Leave as-is.
If the observations show it is pretty bad, then it is decision time as to what you do and how far you go.
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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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