Where is diagnostic port 1998 blazer?

The diagnostic port on a 1998 Chevrolet Blazer is located under the dashboard, near the driver's side. Specifically, it can be found just above the brake pedal and to the left of the steering column. You may need to remove a cover or look closely to see it, as it can be somewhat hidden. This port is used for connecting a diagnostic scanner to read trouble codes from the vehicle's onboard computer.