Check engine or Service Engine? The Service engine light comes on for a few minutes every time you start the car, but then goes off. It will happen every 5K miles or something like that and just needs to be reset by pushin in that little black button in front of it with a penpoint and holding briefly. Because, of course, you are doing your oil changes and other maintenance without this reminder anyway.

If it is your check engine, you need to read your codes. That is done via a little black box that is under the hood, right in front of the driver's (North American)position. Look in the FAQ under features above for details on how to do this and most anything else you are likely to need to do. Your car has the Rex/Regina engine management system which is, in my humble opinion, the most reliable of the several that existed in the 740 series.

Welcome aboard!
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Andy in St. Paul. '89 244 147K mi, '91 745 Regina 202K, '87 245 lost to rust at 225K