There are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired.
Yes
The engine in a 1993 grand marquis is a 4.6 litre/281 cubic inch.
Check the engine end of the upper radiator hose
Have vehicle scanned to determine the problem
how to replace starter on 2000 mercury grand marquis
Thousands of things. Take it to a mechanic who has a scanner and they can tell you what the problem is.
how to changing engine coolant on a 1993 mercury grand marquis gs.
That is one of hundreds of possibilities. See related questions below.
Bank 2 is the drivers side of the engine in a 2000 Mercury Grand Marquis
8 engine cylinders in a V8 engine
does the light illuminate during start up? If not the lamp is burned out. If it does, then the engine computer is likely at fault.