What do the green, yellow, and red LEDs mean on the Innova 5210?
The green LED indicates all engine systems are running normally with no DTCs present and all Monitors have completed diagnostic testing. The yellow LED indicates a possible problem, such as a pending DTC or some Monitors not having completed their diagnostic testing. The red LED indicates a confirmed problem with one or more vehicle systems, with DTCs present and the Check Engine lamp illuminated on the dashboard. (Page 5)
From the official Innova 5210 manual, page 5
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