Spark plug · Champion
Equivalents for the Champion spark plug 3121
Meet the Champion 3121 spark plug. Here are its 345 cross-references: equivalent, compatible and replacement plugs from NGK, Bosch, Champion, Denso and other makers.
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What can replace a Champion 3121 spark plug?
The Champion 3121 is interchangeable with: NGK BKR6EVX, Bosch F7HERO2, Champion RC9MCC4, NGK BKR6EVX11, NGK BKR7EVX11, NGK LPG6. 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.