How do you read fault codes without reader on Skoda Octavia?

To read fault codes without a diagnostic reader on a Skoda Octavia, you can use the onboard diagnostics (OBD) system. Turn the ignition key to the "on" position without starting the engine, then press the accelerator pedal three times within five seconds. After this, the dashboard will display the fault codes through the warning lights, which you can interpret based on the flashing patterns. Make sure to consult a manual or online resources for specific code meanings.