Bosch 7957 Spark Plug

Bosch Nickel Spark Plug 7957 Overview

Bosch 7957 is a conventional nickel-copper spark plug built for dependable ignition performance and value. It uses a yttrium-enhanced nickel center electrode with a copper core to support longer service life than a basic copper plug, while meeting or exceeding OE specifications for nickel-copper core applications.

Compatible With a wide range of import and domestic vehicles, including Hyundai Accent, Kia Rio, Mitsubishi Eclipse, and Mazda Miata applications that call for a 14 mm flat-seat plug with a 1.1 mm pre-gap.

Key Features

• Nickel-Yttrium center electrode with copper core for durable secondary ignition performance
• Conventional nickel-copper construction for OE-style service replacement
• Resistor design rated at 6000 ohms for ignition system compatibility
• Tapered V-profile ground electrode tip for consistent spark exposure
• Ceramic insulator and non-projected design for stable operation
• 14 mm thread diameter, 19 mm reach, 16 mm hex, flat seat
• Manufacturer heat range 8 with a 1.1 mm pre-gap

Product Details

This Bosch Nickel line spark plug is built for drivers and technicians who need a straightforward replacement for secondary ignition service. Part number 7957 is engineered around conventional nickel-copper core construction, making it a practical choice for older and higher-mileage engines that specify this plug style. The Bosch Nickel product line focuses on OE-style fit and function, with materials and dimensions selected to match factory requirements across many applications.

Vehicle coverage includes long-tail fitment searches such as Bosch 7957 spark plug for 1995-2011 Hyundai Accent, Bosch 7957 spark plug for 2006-2011 Kia Rio, and Bosch 7957 spark plug for 1990-1997 Mazda Miata. It also appears in applications for Chevrolet Equinox, Mitsubishi Lancer, Nissan Altima, and Saturn SC2/SL2 models where the listed gap and seat specifications match the engine requirement.

This part cross-references no interchange part numbers in the provided data.

Common Issues This Part Can Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from inconsistent spark delivery
• Misfire conditions related to aged secondary ignition components
• Reduced throttle response from degraded plug electrodes
• Maintenance replacement for vehicles calling for nickel-copper spark plugs

Installation Notes and Tips

• Verify the vehicle’s required gap before installation; listed fitments include gaps such as 0.044 in, 0.040 in, 0.050 in, and 0.060 in depending on application.
• Confirm thread diameter, reach, seat type, and hex size against the engine specification before service.
• Use proper spark plug removal and torque procedures to avoid thread damage in the cylinder head.
• Check ignition wires or coil-on-plug components during replacement if the old plugs show heavy wear or fouling.

Quality Assurance

Bosch manufactures this spark plug to meet or exceed original equipment specifications for nickel-copper core spark plug applications. The Bosch 7957 is built with a ceramic insulator, nickel-based electrodes, and OE-style dimensions for consistent service replacement across the listed fitments.

Compatible vehicle coverage includes 1982-2011 applications across Hyundai, Kia, Mazda, Mitsubishi, Nissan, Saturn, Chrysler, Dodge, Chevrolet, and more, including popular models such as Accent, Rio, Miata, Eclipse, and Altima.