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How do you retrieve engine codes on a 91 buick park ave?

Here is the way to retrieve engine codes on a 1991 Buick Park Avenue:

• Turn the key on but don’t start the car.

• On the right-hand side of the dash, there is a small round or square button (depending on the dash configuration) under the dash (usually just to the left of the gas pedal)

• Push the button on and off 3 times consecutively.

• The code(s) will display in the odometer after a few seconds.

• If you have no codes, “DIAGNOSTICS OK” will display.

• Continue depressing the button to cycle through any other codes if present.