A note to our community regarding COVID-19. Learn more

How do I know if my lawn mower spark plug is bad?

Thumbtack Editors
Answered

It may be time to replace your spark plug if:

  • The engine is dying or failing.
  • You have to add more gas than usual.
  • The spark plug is visibly damaged and broken.
  • You’re having a harder time getting the lawn mower to start. 

If you suspect your lawn mower's spark plug has gone bad, hire a pro to confirm your suspicions. A repair technician can identify the problem and perform repairs.

Ready to hire a Lawn Mower Repair Specialist?

You never pay to use Thumbtack: Get cost estimates, contact pros, and even book the job—all for no cost.