Spark plug · NGK
Equivalents for the NGK spark plug 3121
NGK 3121, a spark plug. 46 equivalents listed: interchangeable and compatible spark plugs across all brands — NGK, Bosch, Champion, Denso…
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What can replace a NGK 3121 spark plug?
The NGK 3121 is interchangeable with: NGK BKR5EK, Bosch N 03, Champion RC 10 DMC, NGK BKR5EKC, NGK VLine23, Bosch FLR 8 LDCU+. 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.