1. Open the driver's door and sit in the driver's seat.
2. Look at the dashboard on the left-hand side.
3. You should see a small cover below the steering wheel.
4. Open the cover to reveal the OBD port.
The OBD port in a Citroen Relay van is typically located under the steering wheel, on the left-hand side of the dashboard. It is usually covered by a small plastic panel that can be easily removed.
