NOTE: The method described below is applicable only to Ford vehicles manufactured before 2008 equipped with the OBD-I diagnostic port.
1. Locate the Diagnostic Connector:
Open the driver's door and find the diagnostic connector (DLC). It's usually located under the dashboard, near the steering column.
2. Prepare a Jumper Wire:
Get a piece of wire or a paper clip and straighten it out. This wire will be used to short two specific terminals in the diagnostic connector.
3. Connect the Jumper Wire:
Insert one end of the wire into the "TEN" terminal and the other end into the "GND" terminal of the diagnostic connector. Make sure the connection is secure.
4. Turn Ignition On:
Turn the ignition switch to the "ON" position without starting the engine. The "Check Engine" light will come on.
5. Wait for Light to Blink:
Wait for the "Check Engine" light to start blinking. This usually takes a few seconds.
6. Turn Ignition Off:
Once the light starts blinking, turn the ignition switch back to the "OFF" position.
7. Remove Jumper Wire:
Disconnect the jumper wire from the diagnostic connector.
8. Turn Ignition Back On:
Start the engine normally by turning the ignition switch back to the "ON" position.
9. Check Indicator:
The "Check Engine" light should now be turned off or have a different code if the problem is persistent.
10. Monitor Performance:
Observe the performance of the vehicle to see if the issue that triggered the "Check Engine" light has been resolved. If it persists or the same code appears later on, it's recommended to have your vehicle diagnosed by a professional.
Remember that this method may not work on Ford Focus models manufactured after 2007 or those equipped with the OBD-II diagnostic system. If you have a newer model or are unsure, consult your vehicle's owner's manual or contact an automotive professional.
