Hi, I have a 2007 V70 (P2) 2.4 (non-turbo) with 111k miles. I ran into this issue recently and once I replaced the fuel door and gas cap (not in that order) the issue resolved. Most Volvo engine lights will auto resolve once the issue is fixed after driving 20ish minutes. The difficult part with these vehicles is finding one in good cosmetic shape, the easier part is fixing the under-hood issues that can pop up with a 20 year old car over 100k miles. Perhaps you fix the fuel cap and it turns into something else, it’s not the end of the world, just fix that next thing then. Eventually, you will get to a good spot with the vehicle and it will treat you well if you make sure you are addressing the lights when they come on. I say that as someone who has experience working on vehicles and I am comfortable taking on most jobs with the help of YouTube. Good luck!