Visual Inspection

WARNING: This page is about a different car, the 2014 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Inspect the following items:
- If any of the following malfunctions are indicated, replace the spark plug.
  - Insulator breakage
  - Worn electrode
  - Damaged gasket
  - Badly burned insulator (sparking side)
    
    Fig 1: Identifying Spark Plug Defects
    Courtesy of MAZDA MOTORS CORP.