How long does it take for the fault light to go off after removing the battery negative terminal?

1 Answers
Gracie
07/29/25 7:57pm
After removing the battery negative terminal, if it's a historical fault, the fault code will be cleared, and the engine fault light will immediately go off; if it's not a historical fault, no matter how long the negative terminal is disconnected, the fault light will still illuminate after power is restored. When a fault light appears on the car dashboard, it's necessary to visit a professional institution where a technician can use a diagnostic computer to read the fault code, identify the corresponding location and cause of the fault for repair, and then remove the fault code from the diagnostic computer. Do not arbitrarily disconnect the battery negative terminal by yourself, as some data in the ECU will be erased after the negative terminal is disconnected, which can lead to degraded vehicle performance. Using the method of disconnecting the negative terminal to remove fault codes may still leave the problem unresolved after restarting.
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