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Denso Spark Plug Numbering System

Wondering what the numbers and letters on a Denso spark plug mean? These Denso spark plug charts explain how Denso's numbering system works.

Denso Spark Plug Numbering Chart

View full size version of Denso spark plug numbering chart.

 

Denso Iridium Spark Plug Numbering Chart

View full size version of Denso iridium spark plug numbering chart.

 

Denso Iridium Spark Plug Numbering Chart

View full size version of Denso iridium spark plug numbering chart.