Spark plug · Bosch
Equivalents for the Bosch spark plug HR 9 AC
The Bosch HR 9 AC spark plug. All its 177 replacement references: compatible and interchangeable equivalents — NGK, Bosch, Champion, Denso…
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What can replace a Bosch HR 9 AC spark plug?
The Bosch HR 9 AC 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.