Cadillac Repair: 1990 Cadillac deville, cadillac deville, letters and numbers

Question
I have a 1990 Cadillac Deville. My check engine light recentely came on and had the oil changed to see if this was the issue. However, the check engine light has remained on. Could my check engine light just need to be reset? If so, how do I reset the check engine light?

Answer
Te check engine light is ON because you have a fault in your electronics of the vehicle.

Perform this simple task:

1. Turn ignition switch to ON, Do NOT start the engine.

2. Simultaneously push and hold the off and warmer buttons for 3 seconds and release the.

3. Write down all the letters and numbers that appear on the display EXACTLY in the order in which they display until they stop.

4. Turn ignition key off.

Let me know what the letter numbers that you got.