Many independent car agencies will provide this equipment for little or no charge. The chance of a service related breakdown is remote. If a problem does occur in or near the city, a call to the agency usually will quickly solve the problem. If out of the city, most vehicles are covered with a manufacturer's warranty. Check with the agency before the rental on the amount that may be spent without prior authorization for non warranty items such as light bulbs and tires, and be sure to check if spending over the predetermined amount.
Vehicles are mechanical, and problems do arise.
Common sense and co-operation go a long way to solving most problems. If there is an accident, the car rental agency should be informed as quickly as is reasonable. There is important information required, so treat the accident as if it is as important as it really is. The agency has a lot of money tied up in the vehicle and their assets must be protected. If taking the vehicle on a trip, or going out of the city, always inquire about a spare set of keys.