NGK 97939 Spark Plug

NGK Laser Iridium Spark Plug for OE Applications

NGK Laser Iridium High Ignitability Spark Plug 97939 is built for OE-style ignition performance in select Toyota and Lexus applications. It combines an iridium center electrode, platinum ground tip, and a high-ignitability dual fine electrode design to support consistent spark delivery, reliable starts, and long service life.

Compatible With 2019-2025 Toyota Corolla, 2022-2025 Toyota Corolla Cross, and 2019-2022 Lexus UX200. This NGK 97939 spark plug is engineered around the factory-style requirements of these vehicles for direct replacement service.

Key Features

• Laser Iridium High Ignitability design for OE application use
• Iridium center electrode tip for durability and stable spark performance
• Platinum ground electrode tip for even wear in distributorless ignition systems
• Fine-wire center electrode design for efficient ignition response
• Copper core and high-grade ceramic construction for heat control and dependable starting
• Resistor type spark plug with 5,000 ohm resistance
• Flat seat, M12 x 1.25 thread, 14 mm hex, 26.5 mm reach
• Pre-gapped to 0.8 mm / .032 in

Product Details

NGK Laser Iridium High Ignitability spark plugs are developed for modern OE ignition systems that require precise spark control and durable electrode materials. The iridium-platinum metallurgy helps maintain consistent performance over extended service intervals, while the copper core and alumina ceramic body help manage heat under normal engine operation. Part number 97939 cross-references NGK DILKAR7S8 for the same application.

For drivers searching for a Toyota Corolla spark plug, Toyota Corolla Cross spark plug, or Lexus UX200 spark plug replacement, NGK 97939 provides an OE-equivalent design matched to the factory high-ignitability specification.

Common Issues This Part May Address

• Hard starting or delayed ignition response
• Rough idle caused by worn spark plug electrodes
• Misfire symptoms related to degraded spark output
• Reduced fuel efficiency from inconsistent combustion
• Service intervals reached on OE-style iridium plugs

Installation Notes and Tips

Verify engine application and spark plug specification before installation. Use the correct torque procedure for the cylinder head material, and inspect ignition coils, boots, and plug wells during service. The pre-gap is set at 0.8 mm / .032 in, but always confirm the gap against the vehicle service information before installation. NGK 97939 is a direct-fit spark plug for the listed Toyota Corolla, Toyota Corolla Cross, and Lexus UX200 applications.

Quality Assurance

NGK tests this Laser Iridium High Ignitability line to OE-level standards for quality and durability. The design uses iridium and platinum electrode materials, a copper core, and ceramic insulation to support consistent ignition performance in the specified applications.