Spark plug · NGK
Equivalents for the NGK spark plug 4123
NGK 4123, a spark plug. Here are its 177 cross-references: equivalent, compatible and replacement plugs from NGK, Bosch, Champion, Denso and other makers.
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What can replace a NGK 4123 spark plug?
The NGK 4123 is interchangeable with: NGK BR5FS, Bosch HR8A, Champion RC8C, NGK BR5FS15, NGK YR5, NGK YR55. 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.