Ford Focus Owners Manual: Wheels and tyres

Battery connection points

CAUTION: Do not connect to the negative (–) terminal of the flat battery. ...

General information

CAUTIONS: Use only approved wheel and tyre sizes. Using other sizes could damage the vehicle and will make the National Type Approval invalid. If you change the diameter of the tyres from th ...

More about Ford Focus:

Ford Focus Electronic Compass
The compass signal originates from the compass module, which is integrated into the interior rear view mirror. The compass display is incorporated into the Front Display Interface Module (FDIM) . The buttons that allow the driver to operate the calibration and zone setting procedures are l ...