OBD II technology monitors all components of the engine management system and can detect a malfunction or deterioration of these components usually well before the driver becomes aware of any problem. Vehicles equipped with OBD II self-test their emission systems while the vehicle is being driven. Vehicles perform up to 11 system tests, depending on year, make and model of the vehicle. Readiness status identifies whether the vehicle's computer has completed the required tests since the last time the vehicle was serviced with a scan tool or had its battery disconnected.
If a system test has been completed, the readiness status for that system will be reported "ready." An uncompleted test will be reported "not ready." Inspection station test equipment checks readiness status as part of the vehicle's emissions inspection and the Vehicle Inspection Report will identify system tests that have not been completed. An OBD II vehicle will not pass the annual inspection unless the required system tests have been completed and reported as "ready."
For more information on Readiness, Warranty, OBDII and Recall information visit avip.vermont.gov