Try this link, ! http://www.extreme-check-engine-light-codes.com/Ford%20OBD1%20Decoder.htm
A check engine light could mean many things on a 1988 Nissan Sentra. The light could mean anything to a fuel cap not being tight enough to bad spark plugs.
Have vehicle scanned to determine problem
When you turn the ignition on the CHECK ENGINE light will not light up at all.
I don't have an answer for you except that you can go to Autozone and they will check your computer for free if your check engine light is on. I don't know what year model this starts at, but it's worth a try so that you don't have to guess!
your check engine light is tellin you there is some thing wrong under the hood you need a OBD reader to check the codes this will tell you what sencer is lacking drive safe
it might be your throttle
There is something not right with the engine.
transmission fluid is checked with the car cooled off -never when running-(daddmac)
After reading the code, fixing the cause, you clear the code with a scan tool.