06 V50 running rich
 

I've got a 06 V50 that just had a check engine light pop up. I had it plugged in by my ex-volvo factory mechanic freind and the msg was that the motor was running rich. His suspicion is the mass-flow sensor but said that maybe my computer just needs an update. He unplugged the computer for a few minutes to reset it. Its been a couple of days and the check engine light hasn't come back...?yet? (xing my fingers)

Anyone had this problem as well?