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What is I/M Readiness?

Within a vehicles OBD system it can have upto 12 monitors within the computer. These monitors are designed to check the emissions within the engine. Three of these monitors will run all of the time, the remaining monitors will run intermittantly during the drive. These monitors reort information to the ECU to let it know whether or not the engine emission performance is compliant with the required levels.

These monitors also report to the ECU  as being 'ready' or 'not ready' . If they are not ready, it basically means they are not yet in a condition to determine whether the system is performing as it should. A vehicle can be rejected for an emissions test depending on how many of the monitors are 'ready' or 'not ready'
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