My wife was driving our 2005 xc70 when the warning light (exclamation point) came on and the message, "Engine System Service Required" came on, as did the check engine light. She drove it home (about 3 miles) and I started it when I got home. The light turns off when I check the message, but the check engine light remains on. The car seems to be running just fine.

This car is relatively new to us; we got it in May and have driven it about 4000 miles, so I am not really aware of its quirks and so on. I have two '98 V70 wagons, and the check engine light is always on on those. Our mechanic says it's fine, and the state even recognizes that Volvos have a habit of doing that, and I have not been required to fix it for annual inspections.

Can I drive the car, or am I in danger of hurting it? Is this a serious issue, or does the message mean something specific?

Thanks

Take the car to an auto parts store, they will either check the codes for you, or give you a scanner for parking lot use. If you don't know how to use a scanner, they will show you how. It is FREE.

Write down the Pnnnn code(s) the scanner will show. Most scanners even write, in English, what is wrong. Write that down also.

A check engine light should never be ignored, on any of your cars, even the older ones.
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Keeping it running is better than buying new

Well, the warning light and the check engine light both went out; apparently, the problem solved itself! Maybe I dodged a bullet on this occasion!

Can you get the check engine code read ASAP? Start there. It may or may not be something serious. Don’t know the 2005’s.

You could also do a visual of the engine compartment. Look for disconnected hoses, wires etc. Check all fluid levels and belts.
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Will I buy another Volvo??? We'll see....