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Although OBD-I provided only basic codes and limited standardization between manufacturers, it was a breakthrough. Mechanics could now plug a diagnostic tool into the car to retrieve fault codes, dramatically speeding up troubleshooting. These systems allowed vehicles to self-monitor and alert drivers when something went wrong.
That’s because rushing into repairs without following a structured diagnostic process often leads to wasted time, misdiagnosis, and unnecessary partreplacements. But students are taught not to blindly replaceparts based on codes, they interpret codes as clues, not conclusions.
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