What type of parts will a mechanic use if required by law to use generic parts instead of OEM parts?

The correct choice is aftermarket parts. These are parts manufactured by a company other than the original equipment manufacturer (OEM). When a mechanic is legally required to use generic parts, they typically turn to aftermarket parts because they often meet the same standards and specifications as OEM parts but are usually more cost-effective.

Aftermarket parts can offer a variety of options for repairs, which can help keep costs down while still ensuring that the vehicle is safe and functional. Using these parts allows mechanics to comply with legal requirements while providing customers with alternatives that may fit their budget better.

In contrast, replacement manufacturer parts refer to parts made to original specifications but are still not necessarily the same as OEM. Market value parts generally relate to the assessed value of the vehicle rather than specific parts. Depreciated parts would refer to parts that have already lost value over time and aren't typically a distinct category used in this context. Therefore, aftermarket parts most accurately fit the description of generic parts that might be mandated for use instead of OEM parts.