What must you do if you discover a defect in your vehicle?

Answer: C — Complete a DVIR and ensure repairs

When you discover a defect in your vehicle, completing a Driver Vehicle Inspection Report (DVIR) and ensuring the necessary repairs is crucial for maintaining safety and compliance. This report is a formal document that helps to identify any mechanical or operational issues that could affect the vehicle's performance and safety. By completing a DVIR, you not only document the defect but also initiate the process for repairs, which is essential for preventing accidents and ensuring the vehicle remains roadworthy. Additionally, addressing defects promptly can help avoid more significant issues down the line, enhancing overall safety for yourself and others on the road. Taking any other actions, such as reporting to a fellow driver or continuing to drive despite knowing there’s a defect, can lead to dangerous situations or potentially legal repercussions for failing to address known issues. Notifying the insurance company is not typically the first step after discovering a defect; the immediate need is to ensure the vehicle is safe to operate.