Spark Plug Symbol Codes

Denso Spark Plug Symbol Code

It is possible, with care, to decode the construction of Denso sparkplugs. This can help in identifying suitable replacement parts from Denso or even equivalents from other manufacturers. We would not recommend using this as your sole method of identifying replacement parts unless you are confident in using the decode.

The three images below show the following:

1. Denso standard/general spark plug symbol code
2. Denso Iridium Power and Iridium Tough (now largely obsolete) spark plug symbol code
3. Denso TT (Twin Tip) and Iridium TT spark plug symbol code. Iridium TT spark plugs have now replaced most Iridium Tough and some Iridium Power spark plugs.

Please note that this image is best viewed at desktop resolutions, it is not formatted for viewing on mobile devices.

NGK Spark Plug Symbol Code

It is possible, with care, to decode the construction of NGK spark plugs. This can help in identifying suitable replacement parts from NGK or even equivalents from other manufacturers. We would not recommend using this as your sole method of identifying replacement parts unless you are confident in using the decode. Below is NGK's spark plug part number decode. This applies to standard copper and platinum plugs. There are additional decodes available for NGK US specification plugs and some spark plug types are beyond the scope of this decode.

Champion Spark Plug Symbol Code

Due to the small text size and formatting of this information we recommend that it is viewed at desktop size and resolution.

Champion's spark plug part number decode (symbol code) can help in identifying suitable replacement parts from Champion or even equivalents from other manufacturers. We would not recommend using this as your sole method of identifying replacement parts unless you are confident in using the decode. Below is Champion's main spark plug part number decode. This applies to standard and OE replacement copper, platinum and Iridium spark plugs. Please note that Champion have several different methods of categorizing spark plugs and therefore not all can be decoded with this information.

Beru Spark Plug Symbol Code

Beru offer two Spark Plug symbol decodes, shown below. The first specifies the main characteristics such as thread size and heat range, the second details thread reach and electrode details. Beru Spark Plug part numbers which comply to these numbering conventions will have a leading section (image 1) and a trailing section (image 2). An example might be 14 F-6 DTU (14mm thread, flat seat, nominal heat range '6', 19mm thread reach, multi polar ground electrode, electrode type being Beru Ultra NiCu).