Who is correct regarding the diagnostic capability for a CHECK ENGINE light illumination after collision repairs?

The reasoning behind why the answer is B lies in the flexibility of diagnostic tools available to technicians. A technician using a generic scan tool can indeed retrieve diagnostic trouble codes (DTCs) and monitor engine parameters, which can be incredibly useful when troubleshooting a CHECK ENGINE light illumination after collision repairs. Generic scan tools can often communicate with the engine control unit (ECU) to identify issues that may not be related to the collision repairs directly, providing valuable insight into any underlying problems.

While it is true that dealerships may have specific tools and proprietary software that can provide more detailed information or capabilities, it is not a requirement that only a dealer can diagnose such issues. Independent technicians equipped with a generic scan tool are fully capable of performing the necessary diagnostics to address the CHECK ENGINE light and determine the cause.

In contrast, the options related to the necessity of dealer diagnostics or exclusive expertise may not fully acknowledge the capabilities of independent technicians and the tools at their disposal. This makes the assertion that Technician B is correct and able to diagnose the issue valid, as they have access to important diagnostic information through the use of a generic scan tool.