The total cost of getting an engine light checked depends on the circumstances. However, mostly it can be done for $100 or above. It must not exceed $150 generally.
Different mechanics charge differently. However, if you are applying for some assistance from an organization, you may receive some discounts of a few dollars. Some of the agencies also allow for free of cost engine checks.
Having a good engine is important for the overall health of your car. If the check engine light is on, make sure you get it checked.