Where do you plug in the code reader on a 2004 Volvo XC90?

In a 2004 Volvo XC90, you can plug in the code reader into the OBD-II diagnostic port, which is typically located under the dashboard on the driver's side. Look for a small, rectangular connector that is usually found near the steering column or just above the brake pedal. Make sure the vehicle is turned off before connecting the code reader. Once connected, you can turn the ignition to the "on" position to read the codes.