Back To Blog Academy

What do the LED Lights mean on my OBD2 Device?

Published on January 2nd, 2024

Picture 2.png__PID:ad052a27-31be-4685-a612-71e45e700788

Innova R&D Team

Here to assist you in any form & shape

Repair vehicles with confidence.

Innova diagnostic scanners assist you in understanding your vehicle, finding problems, and providing guidance for repairs. You can access the same advanced technology used by professionals, without the high costs or subscription fees.

Learn more about Innova Scanners

Green Light

What do the LED Lights mean on my OBD2 Device image 1.png__PID:45e18af8-4df0-45e4-bc77-69971392e5ce

A green light indicates that all engine systems are running normally, which means that all emission monitors are active and performing their diagnostic testing, and no DTCs are present. The vehicle is ready for a Smog Check.

What do the LED Lights mean on my OBD2 Device image 2.png__PID:8f2f9dba-2431-453a-b08a-a6c3b763c177

Not sure which scanner to buy? Take our quiz.

Discover your ideal OBD2 scanner by answering a few questions.
Only takes a few seconds.

Yellow Light

What do the LED Lights mean on my OBD2 Device image 3.png__PID:4e71e84f-8b1e-4191-9722-ed41298675f7

A yellow light indicates that there is a possible problem in one or more of the vehicle’s systems that may prevent the vehicle from passing a Smog Check. Either a Pending DTC is present, and/or some of the vehicle's emission monitors have not run their diagnostic testing.

Red Light

What do the LED Lights mean on my OBD2 Device image 4.png__PID:8bfefd39-41f8-4517-a5aa-d2a631f184f1

A red light indicates a problem in one or more of the vehicle’s systems that will prevent the vehicle from passing a Smog Check. The red LED is also used to show that DTC(s) are present as shown on the scanner's display screen. In this case, the check engine light will light be on in the vehicle.

Back To Blog Academy

Have Questions?

Hop in the discussion board on our community site!
It's a place where we help each other answer questions. Like Reddit but for automotive lovers.

Visit Community

Ready To Diagnose Your Vehicle?

Sometimes, it helps to just push ahead and take a leap of faith! Learn more about our OBD2 scanners and how it can help diagnose the hidden issues with your vehicle.

Get Started