![](https://blog.obdii.shop/wp-content/uploads/2022/05/After-device-connected-with-Vehiclethe-CAT-ET-3-main-unit-light-is-off-and-cannot-work-normally-1-326x245.png)
After device connected with Vehicle,the CAT ET 3 main unit light is off and cannot work normally
After device connected with Vehicle, the CAT ET 3 main unit light is off and cannot work normally Recently Frequently reported by North American customers […]