Failed OBDII Readiness Monitors - The emissions control systems on a vehicle have a number of various sub-systems which evaluate and control the output of emissions on a vehicle. Some systems or "monitors" may only run 1 time per 24 hours, and that's only if the driver meets the manufacturer's requirements to cause them to run.

Top 3 reasons monitors are "not ready" in Vista ca and oceanside

#1 - Recent battery change, dead/jumped-battery, disconnection of battery terminals
#2 - Recent manual reset of a check engine light with a scanner
#3 - A fault has occurred in one or more of the emissions systems

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