usually when the check engine light comes on it is most likely to be a o2 sensor i had a 1990 legend and i had the light turned off and it came back on 5 minutes later the mechanic said it was an o2 sensor wasn't cheap to replace the part cost about 80 bucks and they charged me 75 to install because there is tool you need to twist off the sensor
It means the ECU has detected a problem with the emissions system.
Check the 91 Legend for a bad knock sensor. Check the timing for proper setting, and check for any vacuum leaks.
Replace bulbs Check the fuse Check the stop light switch
take it to your mechanic so he can run a diagnostic.
electronic vehicle monitoring system in the center console. There are two black buttons on each side that can be fliped down! (reset trip computer)
Check your starter it may be grounded when hot.
Check the fuse panel and look for any blown fuses.
check your coolant levels and radiator if they are ok make sure it doesn't have a blown head gasket which are very common with these years of the acura legend..
check the door switch
check the brakes usually click when pads get thin
Check the release fuse first. Then check the relay, and the switch. If these are all ok, then check the solenoid at the release inside of the trunk.
You more than likely have a blown fuse. Check the fuse for the radio.