Spark plug · NGK
Equivalents for the NGK spark plug 4921
NGK 4921 is a spark plug. Browse its 346 equivalents: compatible, interchangeable and replacement spark plugs across NGK, Bosch, Champion, Denso and many more.
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346 equivalents compatible with the NGK 4921 spark plug
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No equivalent for this brand selection.
What can replace a NGK 4921 spark plug?
The NGK 4921 is interchangeable with: NGK BPM6, Bosch F002G40550, Champion C8JY, NGK BPM6A, NGK BPM7A, NGK BPM7Y. 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.