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The wrench has a powerful new partner in the modern automotive workshop: the diagnostic scanner. As vehicles evolve into complex networks of computers on wheels, a technician's ability to accurately diagnose a problem is no longer just a skill, it's a direct function of the technology they wield. A simple code reader might point you to a faulty O2 sensor, but in 2025, that’s just scratching the surface. What if the sensor is fine, but the wiring is bad? What if the fuel trim is off because …