What does the engine light mean on a 2006 Lincoln Zephyr?

The Check Engine light can have many meanings from low oil level to needing water or more serious matters. It's always best to take the car to a mechanic who can "read" the codes and will be able to tell you what is wrong and/or what needs repair. It could be a simple issue or it could be very serious, and do keep driving and ignoring that light could lead to major engine damage and very costly engine rebuilding costs.