@3030la As @2.5x_sleeper noted, it's an LED soldered to the dash panel. It's possible, but unlikely, that the LED is bad. You might try disconnecting and reconnecting the wire harness to the dash - maybe corrosion on the contacts. Do this several times. The same could be done to ECU connectors - there are two big ones, as I recall.
Just as a test, try connecting the two green connectors under your dash, near driver's left knee - the diagnostic connectors. Then, turn the key to RUN. All the lights should start flashing and fans turn on and off, as it goes through a kind of self test. Does the CEL come on? Disconnect them after this test.