Check engine light on 2007 Mazda 3?

39,000 miles and the check engine light came on today.
It's under warranty, but I'd like to stay away from the dealer for now.
Is there a way I can check the trouble code without a code reader? On my old nissan i was able to, buy counting the number of flashes the MIL light blinked after I spun the screw on the computer.
Also, know of any inexpensive code readers that work on this car? and is it OBDII?
 
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