Equivalents for the Japan Parts spark plug B121
Japan Parts B121 is an automotive spark plug — heat range hot, reach 15.2–19.0 mm. Compare its 92 equivalents and find the cheapest compatible plug: NGK, Bosch, Champion, Denso and more.
Technical information Japan Parts B121 spark plug
- Resistor
- no
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What can replace a Japan Parts B121 spark plug?
The Japan Parts B121 is interchangeable with: Bosch GLP275, Champion CH273, Denso DG188, Champion CH273002, Denso DG-188, Beru 100226506. These spark plugs share the same mounting (thread, seat) and heat range.
What are the specifications of the Japan Parts B121?
Reach 15.2–19.0 mm, Heat range Hot, Resistor no, Seat Flat (gasket)
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.