NGK 4959 Spark Plug

NGK BKR6EKC Spark Plug for OE-Style Ignition Service

NGK Standard Spark Plug 4959 is built for drivers who want a direct-replacement spark plug with OE-focused construction and consistent ignition performance. This NGK spark plug uses a copper center electrode, nickel tip materials, and a flat seat design to support reliable combustion in a wide range of domestic and import applications.

As part of NGK’s Standard Spark Plug line, this plug reflects the brand’s long-standing OE supply background and emphasis on original equipment standards. For shoppers searching for an NGK BKR6EKC spark plug, part number 4959, or a replacement for common ignition service on vehicles such as BMW 3 Series and Volkswagen Golf applications, this is a practical service part for routine tune-up work.

Key Features

• NGK Standard Spark Plug, part number 4959
• OE-style spark plug construction for secondary ignition service
• Copper center electrode core material for stable conductivity
• Nickel center and ground electrode tip materials
• Special side ground design with two ground electrodes
• 5,000 ohm resistance
• Pre-gapped to .036 inch
• 14 mm thread diameter, .75 inch reach, flat seat
• 5/8 inch hex size and non-removable nut terminal

Product Details

The NGK BKR6EKC spark plug is engineered with a copper core center electrode and nickel-tipped electrodes to support dependable spark delivery and consistent ignition system operation. Its 6 heat range, 5,000 ohm resistance, and special side ground configuration make it a straightforward replacement choice for vehicles that call for this exact specification. If you are servicing a BMW 3 Series or Volkswagen Golf and need NGK 4959, this plug matches the listed dimensions and design details for the application.

NGK’s manufacturing focus spans domestic and import vehicles, along with motorcycle, marine, and small engine applications, and that OE background is reflected in the Standard Spark Plug line. This part cross-references Bosch 7402 and Anchor 3304 for the same application.

Common Problems This Part Can Address

• Hard starting caused by worn spark plug electrodes
• Rough idle from inconsistent spark output
• Misfire conditions related to aged ignition components
• Reduced fuel economy from degraded spark plug performance
• Loss of throttle response during routine ignition wear

Installation Notes

Verify the thread diameter, reach, seat type, and pre-gap before installation. The NGK BKR6EKC uses a flat seat, 14 mm thread, .75 inch reach, and .036 inch pre-gap, so it should be matched to the engine specification before service. Inspect ignition wires or coil components during replacement, and follow the vehicle manufacturer’s torque specification for spark plug installation.

Quality Assurance

NGK is a major OE spark plug supplier with decades of automotive manufacturing experience and broad coverage across domestic and import vehicle platforms. Part number 4959 is produced to support original-equipment-style durability and operational consistency in approved applications.