Cadillac Repair: 1993 Cadillac Seville - Please help, 1993 cadillac seville, cadillac seville

Question
Hello,

Yes the check engine light is on, but to be honest with you, it has been on for about 2 years.

the whole engine is 100% clean.

engine is 4.9 l

Answer
!. Ignition ON. Engine OFF.

2. Simultaneously push and release the OFF and WARMER buttons on the display panel.

3. Diagnostic codes will stat to appear and then they will stop.

4. Write down EVERYTHING that you see in the EXACT order in which you see the letters or numbers and let me know what they are.

5. turn OFF ignition.