NGK 2420 Spark Plug

NGK D9EA Standard Spark Plug

NGK D9EA standard spark plug 2420 is built for dependable ignition performance in a wide range of domestic and import applications. It uses a copper center electrode core with a nickel center tip and a nickel ground electrode tip for consistent spark delivery and stable combustion.

Compatible With ignition service needs for vehicles that call for a 12 mm thread diameter, .75 reach, flat seat, 18 mm hex, and a .028 pre-gap. This NGK spark plug is a practical OE-style replacement for drivers searching for NGK spark plug 2420, D9EA, and related ignition tune-up parts for Honda Civic and similar applications.

Key Features

• Standard spark plug design for routine ignition service
• Copper center electrode core for efficient heat transfer
• Nickel center and ground electrode tip materials
• Single ground electrode with standard configuration
• 1 ohm resistance for ignition system compatibility
• Flat seat, 12 mm thread diameter, and .75 reach
• Pre-gapped to .028 for installation reference
• Manufacturer heat range 9

Product Details

NGK’s Standard Spark Plug line focuses on OE-level construction and broad vehicle coverage across domestic and import platforms. Part number 2420, also identified as D9EA, follows common service specifications including a stud terminal, 18 mm hex size, and standard ground electrode geometry. For shoppers comparing ignition tune-up parts, this spark plug is a direct match for applications that specify these dimensions and heat range requirements. It is a solid choice when replacing worn plugs in Honda Civic and other vehicles that use the same plug specification.

This part cross-references Federal Parts 2420 and Gates A61 for the same application.

Common Problems It Can Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from inconsistent spark delivery
• Misfire conditions tied to aged ignition components
• Reduced throttle response from degraded plug performance
• Fuel economy loss related to incomplete combustion

Installation Notes and Tips

Verify the required thread diameter, reach, seat type, and heat range before installation. Check the gap against the engine specification before use, even when the plug is pre-gapped. Inspect the ignition wires or coil-on-plug components at the same time to avoid repeat service. For Honda Civic and other fitment-specific applications, confirm the engine’s plug specification against the vehicle service information.

Quality Assurance

NGK is a long-established OE spark plug supplier with North American manufacturing, inventory, and distribution support. The brand’s focus on original equipment standards and broad application coverage supports consistent part selection for ignition service.