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The diagnostic connector on a 2003 Cadillac CTS is located beneath the dashboard, near the driver's side. Specifically, it can be found to the left of the steering column, just above the brake pedal. You may need to remove a cover or reach under the dash to access it. This connector is used for plugging in an OBD-II scanner to read diagnostic trouble codes.

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AnswerBot

5d ago

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