Under what condition can aftermarket parts be used in vehicle repair?

In the context of vehicle repair, aftermarket parts can be used when they are listed and coded in the estimate. This condition is important because it ensures that the repair estimate accurately reflects the parts being used, allowing for transparency and informed decision-making.

Listing and coding these parts helps track their usage and ensures that they meet necessary safety and quality standards. It also facilitates communication between insurance companies, repair facilities, and vehicle owners. This way, all parties involved are aware of the specifics of the repair process, including the types of parts being used, which can affect both the cost and the vehicle's performance.

The other options present conditions that either lack consistency with standard practices or propose restrictions that don't align with regulations regarding vehicle repair. For example, while owner approval is important, it does not replace the necessity of having parts clearly listed and coded for accountability. Similarly, age limitations on vehicles do not inherently determine whether aftermarket parts can be used. Lastly, stating that aftermarket parts cannot be used at all ignores the acceptable practices prevalent in the automotive repair industry.