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Urgent!
Brake booster check valve (broken one). You'll have pretty inoperable brakes if you don't get that addressed.
Call FCP Euro with your VIN number to get the right one. Takes about 10-15 minutes to install, maybe 100 bucks tops.
https://www.fcpeuro.com/products/volvo-brake-booster-vacuum-switch-xc90-31265826#fitment

Don't know where the other one is in the bay or what it is without seeing more, but it sure looks like it's the fuel pressure sensor connector on right side of engine.
 
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