The Ford Focus instrument cluster can be put into a test mode, displaying diagnostic information. This updated procedure works on North American Focus from model year 2011 onward (Mk3)
Time Required: Less than 5 Minutes
Press and hold the "OK" button in the center of the left control pad.
While continuing to hold the "OK" button, turn the key to the "run" position. With push-button start, tap the start button without holding the brake or clutch pedal to enter run mode without starting.
Continue holding the "OK" button for a few more seconds, until the Message Center on the dashboard changes to test mode.
Release the "OK" button, and use the up/down buttons on the left steering wheel control to navigate through the diagnostic modes.
Highlights include a digital speedometer, tachometer, gauge sweep, message center display tests, LED test, engine temperature, battery voltage and the display of Diagnostic Troubleshooting Codes. These DTC codes are not a substitute for an OBD-II reader, but may provide additional information about the car's operation.