To enter the test mode on the Ford Mondeo III 2003, you must:
Insert key into the ignition lock.
Then press and hold the day mileage button.
Turn the ignition key to the "II" position by continuing to hold the reset button.
Next, omit the reset button after the message "TEST" appears on the dometer display.
While in test mode, you can pass all the tests without starting the engine and running the engine.
Turn off the ignition for the test mode.
