If you want to perform your own repairs on your 1994 Buick LeSabre, you will need to properly identify the problem. The '94 LeSabre has a system called On Board Diagnostics (OBD) that uses codes to tell the mechanic where the problem lies. Unfortunately, 1994 was a transition year between OBD-I and OBD-II standards, so standard readers do not work with this vehicle. If you do not want to take the car to a GM service center to have the codes read, you will need to improvise.
Unbend the paper clip into a "U" shape.
Locate the diagnostic port on your 1994 Buick LeSabre. It is located under the dash on the driver's side. The diagnostic port contains 16 pins in two rows of eight.
Insert the bend of the paper clip between pins five and six. They are not marked. Begin at the left on the top row, and count over five pins.
Insert the key into the ignition and turn it back until it clicks. The check engine light will blink in a specific pattern--a series of blinks with short pauses, followed by a longer pause, then another series of short blinks. Write down the numbers produced by the blinking check engine light. For example, if it blinks twice, followed by a pause and four blinks, write down "24." The OBD system will repeat each code three times before giving you the next number. Each number corresponds to a diagnosis, which can be found in your service manual.
