NGK 2115 Spark Plug - Exhaust Side

NGK Iridium IX Spark Plug 2115

NGK Iridium IX Spark Plug 2115 is built for drivers who need stable ignition performance, precise gap control, and OE-style reliability. With an iridium center electrode, nickel ground electrode, and a 5,000-ohm resistor, this plug is suited for a wide range of import and domestic applications, including Hyundai Sonata, Kia Optima, and Mitsubishi Mirage service needs.

Key Features

• Iridium center electrode tip for consistent spark delivery
• Copper core center electrode for efficient heat transfer
• Nickel ground electrode with taper-cut tip design
• 5000 resistance rating for ignition system compatibility
• Pre-gapped at .044 inches; verify against vehicle specifications before installation
• 14 mm thread diameter, .75 reach, and flat seat design
• 13/16 hex size for standard spark plug service tools
• NGK part number BPR5EIX-11, stock number 2115

Product Details

The NGK Iridium IX Spark Plug line is engineered for applications that call for durable electrode materials and dependable ignition performance. Part number 2115 uses an iridium tip at the center electrode to support a fine, stable spark, while the copper core helps manage heat transfer. The taper-cut ground electrode design and standard single-ground configuration are paired with a flat seat and non-removable nut terminal for broad service compatibility. This part cross-references DENSO Auto Parts 4221 for the same application.

Compatible With long-tail search needs such as 2001-2006 Hyundai Santa Fe spark plug replacement, 2001-2006 Kia Optima ignition service, and 1991-1999 Mitsubishi Mirage tune-up maintenance. It also appears in fitment for vehicles such as Hyundai Sonata, Dodge Caravan, and Toyota Corolla, making NGK 2115 a practical reference for a wide range of older and newer engine service jobs.

Common Issues This Spark Plug Can Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from inconsistent ignition output
• Misfire concerns related to excessive electrode wear
• Reduced throttle response from degraded spark quality
• Maintenance replacement for vehicles calling for a .044-inch gap

Installation Notes and Tips

• Confirm the required gap for your exact engine before installation; fitment notes list several applications that require .040, .042, .044, or .050 inches.
• Use the correct torque procedure for the cylinder head material and plug seat type.
• Inspect ignition wires or coil-on-plug components during service to avoid repeat misfire complaints.
• Verify thread diameter, reach, and hex size against the original plug specification.
• For fitment examples, this part fits 2001-2006 Hyundai Santa Fe, N/A; fits 2001-2006 Kia Optima, N/A; fits 1991-1999 Mitsubishi Mirage, N/A.

Quality Assurance

NGK is a major OE supplier and manufacturer of spark plugs for domestic and import vehicles in North America, with more than 80 years of automotive experience. That OE background, combined with global manufacturing and distribution capability, supports the durability and operational consistency expected from NGK 2115 and the Iridium IX Spark Plug line.