How do you read the engine codes on a 1992 Oldsmobile regency?

To read the engine codes on a 1992 Oldsmobile Regency, you'll need to locate the ALDL (Assembly Line Diagnostic Link) connector, usually found under the dashboard near the steering column. Use a jumper wire to connect terminals A and B on the connector. Then, turn the ignition key to the "On" position without starting the engine; the check engine light will blink to indicate the trouble codes. Count the long and short flashes to decipher the codes, or consult a code chart specific to your vehicle for interpretation.