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OBD II Basics
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Why Monitors May Not Be Ready
What makes a monitor appear as "Not Ready "?

Once any non-continuous monitor runs completely, at least one time, it will be displayed as "Ready", and will continue to be displayed as "Ready" unless:
  • Someone erases DTCs with a scan tool

  • Or, power to the vehicle computer is interrupted for any reason. This commonly happens when the battery goes dead or is disconnected.
In either case, non-continuous monitors change back to "Not Ready". They stay that way unless the vehicle is driven until the monitors can run again

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