The coronary arteries regulate the supply of blood to your heart muscle depending on how much oxygen your heart needs at the time, as indicated by: 1  The number of times your heart beats per minute (heart rate). 2  Your blood pressure. 3  The force of your heart's contractions.  The thickness of your heart muscle.
When your car's Check Engine light comes on, it's usually accompanied by a sinking feeling in the pit of your stomach. The light could mean a costly problem, like a bad catalytic converter, or it could be something minor, like a loose gas cap.
As a result, the check engine lights themselves (and the range of well more than 100 possible problems they can detect) vary considerably. On some cars, the light simply goes on. On others, it may flash red to indicate an immediate, potentially damaging situation or simply illuminate for non-emergency problems.