Spark plug · NGK
Equivalents for the NGK spark plug 3971
Meet the NGK 3971 spark plug. Browse its 165 equivalents: compatible, interchangeable and replacement spark plugs across NGK, Bosch, Champion, Denso and many more.
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What can replace a NGK 3971 spark plug?
The NGK 3971 is interchangeable with: NGK BKR6ES, Bosch F 7 DER, Champion RC9YC, NGK BCPR6ES, NGK BPR5EGP, NGK BPR5EP-11. 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.