Spark plug · NGK
Equivalents for the NGK spark plug 6821
Meet the NGK 6821 spark plug. Here are its 47 cross-references: equivalent, compatible and replacement plugs from NGK, Bosch, Champion, Denso and other makers.
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What can replace a NGK 6821 spark plug?
The NGK 6821 is interchangeable with: NGK C8HA, Bosch UR 2 AS, Champion Z6, NGK C8HSA, NGK CR8HS, NGK CR8HSA. 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.