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? 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. Depending on the year, make and model of your vehicle, there may be half a dozen or more OBD monitors that must have completed. A single or multiple "NOT READY" indications will prevent your vehicle from passing the emissions inspection.
Common Causes of Not Ready Rejection for Emissions Testing
All of the applicable OBD monitors for your year, make and model of vehicle must have run and completed to be accepted and pass an OBD plug-in emission test. Any of the following may cause your vehicle to not be ready:
Disconnecting the battery for any reason. This erases the memory in the PCM, including stored fault codes and previous OBD monitor test results. It's like resetting the clock back to zero. Consequently, it may take several days (or even weeks) of driving before all of the monitors will run, allowing your vehicle to be tested.
Erasing stored codes with a scan tool. This also resets all of the monitors back to zero, so allow plenty of time for the monitors to run before driving back to the emissions test facility. If any of the erased fault codes reappear, it may prevent one or more of the monitors from completing. Disconnecting sensors. This will prevent the monitors from running and will likely set one or more fault codes.
Removing the catalyst converter. This is emissions tampering and is illegal for street-driven vehicles.
17年15万英里，OBDII Monitors Not Ready
Catalyst - Evaporative System
Oxygen Sensor - Oxygen Sensor Heater
有道理吗？汽车运行正常，也没有 code。因为新冠疫情半年多不开，电池坏了才换过。
比如排气管，converter，消音器等无明显破漏，没有code直接pass。一次年检说车dashboard的引擎light灯泡坏了，换新灯后才能pass。
忘了说换电池后，汽车没有上路过。
引擎code检测应该cover所有问题，包括排气系统。我们州规定没有引擎code就pass emission inspection，当然车子排气系统看上去要没有毛病。
Evaoprative Sytem 可能需要加满汽油才能reset？
https://repairpal.com/drive-cycle-issues
车厂家drive cycles 的定义有差别。基本上需要重复以不同速度行驶相应时间。包括高速。有时要好些天。如果车况一直不错，只是最近换了电池，则一般不会有什么问题。O2 sensor 一般很快就会ready. Evap 要耐心些。
等有关部件，未果。最后发现是汽油泵管道接口“掉链子”。
OBD Monitor Not Ready
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? 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. Depending on the year, make and model of your vehicle, there may be half a dozen or more OBD monitors that must have completed. A single or multiple "NOT READY" indications will prevent your vehicle from passing the emissions inspection.
Common Causes of Not Ready Rejection for Emissions TestingAll of the applicable OBD monitors for your year, make and model of vehicle must have run and completed to be accepted and pass an OBD plug-in emission test. Any of the following may cause your vehicle to not be ready:
Disconnecting the battery for any reason. This erases the memory in the PCM, including stored fault codes and previous OBD monitor test results. It's like resetting the clock back to zero. Consequently, it may take several days (or even weeks) of driving before all of the monitors will run, allowing your vehicle to be tested.
Erasing stored codes with a scan tool. This also resets all of the monitors back to zero, so allow plenty of time for the monitors to run before driving back to the emissions test facility. If any of the erased fault codes reappear, it may prevent one or more of the monitors from completing.
Disconnecting sensors. This will prevent the monitors from running and will likely set one or more fault codes.
Removing the catalyst converter. This is emissions tampering and is illegal for street-driven vehicles.
https://www.aa1car.com/library/obd_monitor_not_ready.htm
Three OBD monitors on this vehicle are NOT READY:
the Catalyst, EVAP and HEGO oxygen sensor monitors.
专业的scanner甚至可以直接测试evap系统，不用等自己完成multiple drive cycles.
建议做做功课，了解一下自己车的drive cycle. 比如冷启动几次，低速行驶多长时间，高速行驶（保持引擎转速在一定程度）多长时间（有的只需几分钟），几次drive cycles...
相信你一定有自己的obd2 reader. 先读code (没有故障code) 然后直接转到I/M, 一项一项check, 你就可以发现包括evap是否ready 的信息。