Spark plug · NGK
Equivalents for the NGK spark plug 6221
The NGK 6221 spark plug. Here are its 36 cross-references: equivalent, compatible and replacement plugs from NGK, Bosch, Champion, Denso and other makers.
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What can replace a NGK 6221 spark plug?
The NGK 6221 is interchangeable with: NGK BM6F, Bosch HS 8 E, Champion DJ8J, Denso T20M-U, Denso WA20M, Denso WA20M-U. These spark plugs share the same mounting (thread, seat) and heat range.
Cross-references and specifications are provided for guidance only. The wrench size can vary by brand, and some data is inferred from the plug code or an equivalent reference. Always check the vehicle manufacturer's recommendation before buying and fitting.