[etta]

Hi! This is my first time, so be gentle...
My "Check Engine" light came on last night while driving on the freeway. When I stopped, the idle was surging as it sometimes does when I start the car.
When I turned the ignition this morning and pushed the "Check Engine" light a few times, it flashed a sequence indicating a code of 2142. (2 flashes, pause, 1 flash, pause, 4 flashes, pause, 2 flashes, pause, then 1 long flash before cycling again)
Any idea what this means?
Thanks!