Spark plug · Bosch
Equivalents for the Bosch spark plug W 9 EC
Bosch W 9 EC, a spark plug. Here are its 60 cross-references: equivalent, compatible and replacement plugs from NGK, Bosch, Champion, Denso and other makers.
Buy this spark plug Bosch W 9 EC — best retailers
Partner links: a purchase made through these links may earn us a commission, at no extra cost to you.
What can replace a Bosch W 9 EC spark plug?
The Bosch W 9 EC is interchangeable with: NGK B-4, Bosch W 10 EC, Champion J8C, Champion J11C, Denso W14, Denso W14-U. 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.