Spark plug · NGK
Equivalents for the NGK spark plug 7840
NGK 7840 is a spark plug. 36 equivalents listed: interchangeable and compatible spark plugs across all brands — NGK, Bosch, Champion, Denso…
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36 equivalents compatible with the NGK 7840 spark plug
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What can replace a NGK 7840 spark plug?
The NGK 7840 is interchangeable with: NGK C5HSA, Bosch U 6 AC, Denso U17F, NGK C5HSB, NGK CR5HS, NGK CR5HSA. 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.