I am not a mechanic and found this device very useful. Every time we make a sharp left or right turn, our dashboard beeps and displays a triangle. After connecting the car scanner, he immediately alerted us with a code. When we googled the code we found that there is a loose connection in the wiring harness. This is helpful because I called Toyota and gave them the code and the reason for the code and they couldn't fool us. I can only recommend this car scanner.
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