Spark plug · Bosch
Equivalents for the Bosch spark plug WR 4 AC
The Bosch WR 4 AC spark plug. All its 119 replacement references: compatible and interchangeable equivalents — NGK, Bosch, Champion, Denso…
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What can replace a Bosch WR 4 AC spark plug?
The Bosch WR 4 AC is interchangeable with: NGK B7H, Bosch W 4 AC, Champion L5, NGK B8H, NGK B7HV, NGK B7HZ. 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.