The Loyale is a bit tricky to diagnose since it is Pre-OBD2, harder to access the codes to determine why the Check Engine light is coming on, which is the first step in diagnosing this.
First, is the car still operating normally, no driveability problems since the CEL came on?
Now, the easiest way to find out what code is displayed we need to drive the car, when the CEL in the dash comes on, you will need to safely pull over, and while the light is on, read the flashing light on the Computer control unit that is under the drivers side dash, mounted directly under the steering column, you may want to remove that cover under the dash ahead of time, so you can have an easier time reading the code . There will be a little hole in the computer, on the side of the computer facing the drivers seat, in this hole is a red light that will blink, when there is a problem, the light blinks a code automatically. You have to read the "blinks" say you see the light flash slow 2 times and then fast 3 times..that would be a code 23, so you get the idea, watch the blinking a few times to verify what code or codes you get, this way you can let me know the code/codes and then we can further diagnose this problem. Good luck.
Let me know, Kevin C.