NGK 48915 U4013 COP Waste Spark Ignition Coil for 01-05 Miata

Vehicle Fitment

• 2001-2005 Mazda MX-5 Miata

Fitment Notes

• OE cross-reference: Mazda BP6D-18-100A, BP6D-18-100A-9U
• Aftermarket cross-reference: Standard Motor Products UF-408/UF408, Walker Products 921-2060, Beck/Arnley 178-8481, BWD E428, Echlin IC528, Hitachi IGC0072, Intermotor UF408, Import Direct Ignition 23-0253, Duralast C1339
• Sold individually - the MX-5's 1.8L inline-4 typically requires multiple coils for a full replacement

Features

• Coil-on-plug (COP) waste spark design eliminates the need for spark plug wires
• Vacuum-sealed premium epoxy resin and thermoplastic housing provide superior dielectric strength and voltage insulation
• Streamlined internal path to the spark plug reduces shorts and current fluctuation
• Engineered to meet or exceed OE performance and durability standards
• Developed and tested in an ISO 17025-accredited lab under extreme conditions
• Backed by a 3-year/36,000-mile warranty

Specifications

• NGK part number: U4013
• Stock number: 48915
• Coil type: COP (Waste Spark)
• Ignition type: Distributorless
• Connector gender: Female
• Terminal gender: Male
• Terminal quantity: 3
• Terminal type: Blade
• Voltage: 12V
• Mounting bracket included: No
• Oil filled: No

Included Components

• 1x Ignition Coil

Product Description

The NGK 48915 (U4013) is a coil-on-plug waste spark ignition coil built specifically for the 2001-2005 Mazda MX-5 Miata, matching the factory BP6D-18-100A part number. As a waste spark design, it fires companion cylinder pairs together, eliminating the need for spark plug wires and simplifying the ignition path compared to older distributor-based systems.

The coil's vacuum-sealed epoxy resin and thermoplastic housing are built for strong dielectric strength and voltage insulation, while the streamlined internal spark path helps reduce shorts and minimize current fluctuation over time. NGK develops and tests these coils in an ISO 17025-accredited lab under conditions well beyond normal driving, aiming for OE-level or better durability, and backs the coil with a 3-year/36,000-mile warranty.

This is a solid OE-quality replacement for NA-generation Miata owners dealing with a misfire, rough idle, or ignition-related check engine light. Since it's sold individually and most 4-cylinder ignition system refreshes benefit from replacing all coils at once, consider ordering the quantity needed to cover your full engine rather than a single unit if you're doing a complete ignition tune-up.