When is it required to exchange the vehicle’s fire extinguisher?

1. Every other annual test, meaning once every two years.
2. Correct answer: When it was fully or partially used, or when its pressure gauge indicates low internal pressure.
3. Every year, before the vehicle’s annual test.
4. When you cannot hear the material moving inside the fire extinguisher.

WhyThe fire extinguisher is replaced if it has been used, even partly, or if its gauge shows low pressure.