Vague error warnings can be so annoying! Sorry you’re dealing with this situation.
If you need to know how to fix reduced engine performance in a Volvo XC90, you will probably need a mechanic’s help. Unfortunately, the reduced engine performance alert is not uncommon for Volvo XC90s. Your mechanic may try three different solutions:
Here’s some good news: If the problem is simply not resolvable, the dealership may buy back your vehicle. Either way, it’s wise to document this problem with photos and report it to your dealership immediately. Meanwhile, try to get an appointment with a Volvo mechanic.
Good luck with your Volvo! Here’s hoping you can hit the road again soon.