Spark plug · NGK
Equivalents for the NGK spark plug 7121
NGK 7121 is a spark plug. Here are its 110 cross-references: equivalent, compatible and replacement plugs from NGK, Bosch, Champion, Denso and other makers.
Buy this spark plug NGK 7121 — best retailers
Partner links: a purchase made through these links may earn us a commission, at no extra cost to you.
What can replace a NGK 7121 spark plug?
The NGK 7121 is interchangeable with: NGK B10EG, Bosch W 2 CS, Champion RC 9 YC 4, NGK B10EV, NGK B11EG, NGK B10ECS. 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.