Which parts of the car must be in good condition to prevent too much noise and gases entering the car?

In New Zealand, it is very important to keep vehicles in good working condition, particularly the engine and exhaust system. These parts must be maintained to prevent excessive noise and the entry of harmful gases into the vehicle. If these components fail, they not only pose a threat to the health of the driver and passengers but may also have a negative impact on the environment.

The correct answer is 2. Engine and exhaust system.