Equivalents for the Bosch spark plug Sp21
Bosch Sp21 is a spark plug. Here are its 19 cross-references: equivalent, compatible and replacement plugs from NGK, Bosch, Champion, Denso and other makers.
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19 equivalents compatible with the Bosch Sp21 spark plug
No equivalent for this brand selection.
What can replace a Bosch Sp21 spark plug?
The Bosch Sp21 is interchangeable with: NGK BPR5EFS-10, Bosch HR 8 D+X, Denso T10, NGK TR5, Bosch HR 8 DCX, Bosch HR 9 DCX. 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.