2004 Buick Regal Owner's Manual - Page 126

Speedometer and Odometer The speedometer shows the vehicle's speed in both miles per hour (mph) and kilometers per hour (km/h). The odometer shows how far the vehicle has been driven in either miles (used in the United States) or in kilometers (used in Canada). The vehicle has a tamper-resistant odometer. If ERROR is displayed, this indicates someone has probably tampered with it and the numbers may not be accurate. You may wonder what happens if the vehicle needs a new odometer installed. If the new one can be set to the mileage total of the old odometer, then that will be done. But if it cannot, then it will be set at zero and a label must be put on the driver's door to show the old mileage reading when the new odometer was installed. Trip Odometer The trip odometer tells how far the vehicle has been driven since it was last reset. To set the trip odometer to zero, press the button on the right side of the instrument panel cluster. The trip/select reset button will go back and forth between the odometer and the trip odometer if the button is pressed and released within 1.5 seconds. If the button is pressed and held for longer than 1.5 seconds while in the trip odometer mode, it will be reset to zero. If the button is pressed and held for longer than 1.5 seconds while in the odometer mode, it will have no effect. 3-28