I was checking for codes on the odometer(push the odometer button and turn key on) and the display said C-CODE 67 89 then 3 seconds later it said 00 00. I did it again and it said 67 91, then 00 00. I did it 4 different times and the last number would be 93,95,etc, but would end in 00 00. Could someone please fill me in.