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Posts Tagged: readiness monitor

OBDII Readiness Monitor

What is a readiness monitor and how do they work? An OBDII  readiness monitor is a software protocol in the car’s computer that self-tests every section of the emissions system. The system was developed to prevent drivers from gaming their state’s emissions testing. In the past, drivers would get a trouble code showing a problem with a sensor or a system issue that was outside of spec. They would then disconnect the battery cables or use a scan tool to erase the stored codes and do a hard reset on … Read More

Readiness Monitors and Drive Cycles

What are readiness monitors and drive cycles? If you want to get your vehicle inspected, your car’s readiness monitors must be in the “ready” state in order to pass the test. And that means you must complete a drive cycle. In the old days of OBDI, you could reset the computer and run your vehicle over to the emissions testing station. Not anymore. Everytime you clear the codes from the computer, you’re resetting the computer and it must start all its testing from scratch. Each drive cycle routine has its … Read More


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