Spark plug · Bosch
Equivalents for the Bosch spark plug N 21
The Bosch N 21 spark plug. Compare its 51 equivalents and find the cheapest compatible plug: NGK, Bosch, Champion, Denso and more.
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51 equivalents compatible with the Bosch N 21 spark plug
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What can replace a Bosch N 21 spark plug?
The Bosch N 21 is interchangeable with: NGK BPR2E, Bosch WR 9 DC+, Champion RN 12 Y, NGK BPR4E, NGK BPR4ES, NGK BPR4EY. 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.