It should work pretty much as stated above... While the key is in the ignition and in the off position, press the "tripmeter reset button" (located on the bottom right hand side of the tachometer). Then immediately turn the key to start the car, while keeping the tripmeter reset button pressed. Hold the button until the information display between the tacho and speedo changes to the "test" mode (should take approximately 5 to 10 seconds).
What model do you have? It is possible that this test diagnostic mode is only available on models with the trip computer (i.e. LX and Zetec).
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