Pre-1996 Models

• 1). Loosen and remove the negative battery cable from the battery with a wrench. Lay the cable aside to prevent accidental contact with the battery terminal.
  
  
• 2). Wait 15 minutes. During this time, the capacitors that power the on-board computer's memory will discharge. This resets the computer's memory and the check engine light.
  
  
• 3). Reconnect the negative battery cable. Tighten the battery cable clamp bolt securely with the wrench. Test-drive the vehicle to verify that the check engine light remains off while driving.
  
  

Post-1996 Models

• 1). Attach the scan tool or code reader to the diagnostic port located under the driver's side of the dash near the steering column. Turn the ignition key to the "Run" position.
  
  
• 2). Select the "Read" button on the scan tool or code reader and write down all the stored trouble codes for future reference. Select the "Erase" or "Clear" button to remove the stored codes and reset the check engine light
  
  
• 3). Turn the ignition key off and unplug the scan tool or code reader from the diagnostic connector. Test-drive the vehicle to verify the repair resolved the problem and the light does not reappear.