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if you just had the oil and filter changed..the technician did not reset the alert in the cars command module..therefor the check engine light will come on until this alert is removed from the start up sequence in the cars' computer.. get that done and it should be fine..
Many issues can cause this alert from a loose gas cap to poor air intake due to dirty filter , poor running conditions. It needs to be hooked up to computer to determine problem. Sometime by removing the red battery terminal and replacing it after a couple minutes you are resetting the computer and you can get another alert that tells you exactly what the problem was prior to the required alert coming on which over rides all others.