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Hello, I'm Brandon.
For the 2005 XC90
Number 1 thing you need to be concern is the transmission. These transmission need to be service every 50k miles.
Number 2 is the fuel control module.
Number 3 is the instrument gauge cluster.
These are top 3 things that commonly failed.
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For the 2009 XC90
Top 3 components to watch out for : Transmission, oil trap (PCV) and the alternator.