engine light on, ONSTAR diagnostic says "electronic fuel control system", is it serious?

Question

if the car drives ok, can i w8 a week to get service?

Answer 1

Electronic fuel control system, On star should be able to give you a code, other than that you need the code, When the Check engine light comes on it means you are 1.5 above emission standard, The check engine light main function is to protect the catalytic convertor which control emissions, How long can you wait is up to the car.