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It has 64K miles, been running great, and the light came on. Dealer is 1 1/2 hr away and its NYE, so I'm hoping someone here can point me toward a diagnostic starting point.
Suggestions??
The OBDII port is inside your car. Take it to Autozone, they'll read it for free. If it's not blinking than it's most likely a sensor/emissions related code as the previous poster stated.