Equivalents for the Wellman spark plug W403
Wellman W403 is an automotive spark plug featuring reach 15.2–19.0 mm, heat range hot. Browse its 186 equivalents: compatible, interchangeable and replacement spark plugs across NGK, Bosch, Champion, Denso and many more.
Technical information Wellman W403 spark plug
- Resistor
- no
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186 equivalents compatible with the Wellman W403 spark plug
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No equivalent for this brand selection.
What can replace a Wellman W403 spark plug?
The Wellman W403 is interchangeable with: Bosch CH166, Champion W430, Denso DG122, Bosch CH222, Bosch GLP032, Champion CH166. These spark plugs share the same mounting (thread, seat) and heat range.
What are the specifications of the Wellman W403?
Reach 15.2–19.0 mm, Heat range Hot, Resistor no, Seat Flat (gasket)
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.