July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Resistance Inspection

Measure the resistance of the spark plug using a ohmmeter as shown in the figure below.

Fig 1: Measuring Resistance Of Spark Plug Using Ohmmeter

Courtesy of MAZDA MOTORS CORP.

If not within specification, replace the spark plug.
Spark plug resistance [25°C {77 °F}]

3.0-7.5 kilohms