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Where is the diagnostic connector in a 1990 Jeep Wrangler?

The diagnostic connector (OBD-I) in a 1990 Jeep Wrangler is located under the dashboard, on the driver's side. It's usually near the steering column, but its exact position can vary slightly depending on the trim level and any aftermarket modifications. You might need a flashlight to find it. It's a rectangular connector with multiple pins.