Ok so I've had my car exactly 2 years, love it..... but... last week it went in for it's 22,500 maint. no problems, drove 800 miles to KY, had a great weekend family gathering, turned car on for the return (12 hour) trip on Sunday morning and the check engine light came on..What to do?? Drove all the way home on pins and needles, realizing this wasn't a great decision. The car sounded and acted normally except that it was a bit rough on start up. So Volvo just called to let me know the intake valves need to be replaced and that it will take a few days. Has anyone else needed this repair? What causes the problem? Any insight is appreciated.