The EVAP (Evaporative Emission Control System) monitor checks for fuel vapor leaks (including a loose or missing gas cap). The Catalyst, EVAP and HEGO oxygen sensor monitors. Three OBD monitors on this vehicle are NOT READY: The OBD monitors that only run under certain conditions include the EVAP monitor, HEGO monitor (Heated Exhaust Gas Oxygen sensor), Misfire Monitoring to detect ignition and fuel related misfires that may cause emissions to increase and/or damage to the catalytic converter.įuel System Monitoring to detect changes in fuel mixture that may cause emissions to increase.Ĭomprehensive Component Monitoring to detect any major faults in engine sensors that may cause emissions to increase. Some checks are "continuous" and are ongoing all the time. The OBD system monitors some functions every time you drive your vehicle, but only checks other functions under certain driving or operating conditions.
With the applicable emissions laws, and that your vehicle is not polluting. This tells the emissions test computer that your vehicle is performing within emissions limits for your year, make and model, and that your vehicle is in compliance To pass an OBD II plug-in emissions inspection test, all of the OBD monitors must have run and successfully completed with no faults found. A single or multiple "NOT READY" indications will prevent your vehicle from passing the emissions inspection. Depending on the year, make and model of your vehicle, there may be half a dozen or more OBD monitors that must have completed.
It means your Onboard Diagnostic System (OBD II) has NOT completed all of its self-test monitors that keep an eye on the performance of your emissions control systems. You've driven your vehicle to the emissions test station to have it tested, but your vehicle was rejected because it was "Not Ready." What exactly does "Not Ready" mean? OBD Monitor Not Ready by Larry Carley copyright
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