NGK 5266 Spark Plug

NGK Laser Iridium Spark Plug for Honda Civic

NGK 5266 is a Laser Iridium spark plug built for precise ignition performance and OE-style fitment. It is listed for 2006-2011 Honda Civic applications and uses a 0.044 in pre-gap per OE specifications.

Key Features

• Laser Iridium center electrode tip for stable spark delivery
• Trapezoid ground electrode tip design with standard ground configuration
• 0.044 in pre-gap size for OE-specified Honda Civic applications
• 5000 ohm resistance for ignition system compatibility
• 14 mm thread diameter, 0.75 in reach, and flat seat design
• NGK part number 5266 / IZFR6K-11S

Product Line Details

NGK Laser Iridium spark plugs are part of NGK’s OE-focused ignition line. NGK supplies spark plugs for a wide range of domestic and import vehicles and builds this line around durable materials, consistent manufacturing, and original-equipment standards. For Honda Civic owners, NGK 5266 provides a direct-match spark plug specification for the listed model years.

Detailed Description

This NGK spark plug combines an iridium center electrode tip with a nickel ground electrode core and copper center electrode core to support consistent ignition performance. The flat seat, 5/8 hex size, and non-removable nut terminal match common OE service requirements, while the 6 heat range and 0.044 in gap align with the listed Honda Civic application. If you are servicing a 2006-2011 Honda Civic, NGK 5266 is a direct-reference spark plug identified as IZFR6K-11S.

This part cross-references DENSO Auto Parts 4504 for the same application.

Common Issues This Part Can Address

• Misfires caused by worn or fouled spark plugs
• Hard starting from degraded ignition performance
• Rough idle in 2006-2011 Honda Civic models
• Reduced throttle response from inconsistent spark delivery
• Service replacement for plugs matching OE gap and heat range specs

Installation Notes and Tips

Verify the gap before installation and confirm the plug matches the vehicle’s OE specification of 0.044 inches. Use the correct 5/8 in spark plug socket and follow the manufacturer’s torque specification for the engine. For Honda Civic service, inspect ignition coils and plug wells during replacement to help maintain consistent ignition performance.

Quality Assurance

NGK is a long-established OE supplier with extensive North American manufacturing and distribution support. The brand’s ignition products are built to original-equipment standards for durability and consistent operation across domestic and import applications.