Bosch 7402 Spark Plug

Bosch Nickel Spark Plug 7402 Overview

Bosch 7402 is a conventional nickel-copper spark plug built for steady ignition performance and OE-style service life. It uses a yttrium-enhanced nickel center electrode with a copper core, along with a projected ceramic insulator and resistor design for consistent firing in a wide range of import applications.

Compatible With select Audi, BMW, Saab, Suzuki, Volkswagen, and Porsche applications, this Bosch Nickel line spark plug is engineered to meet or exceed original equipment specifications for nickel-copper core spark plugs. The preset gap and multi-ground electrode design make Bosch 7402 a direct replacement choice for many 1991-2006 vehicles, including BMW 318i, Audi A4, and Volkswagen Jetta applications.

Key Features

• Conventional nickel-copper spark plug for OE-style replacement service
• Yttrium-enhanced nickel center electrode with copper core for longer service life
• Resistor design rated at 6000 ohms for ignition system compatibility
• Preset .9 mm gap; do not gap before installation
• Multiple ground electrode design with two ground electrodes
• Projected ceramic insulator for stable combustion chamber exposure
• Flat seat, 14 mm thread diameter, 19 mm reach, and 16 mm hex size

Product Details

The Bosch Nickel product line focuses on practical ignition performance and value for drivers maintaining older European and import vehicles. Part number 7402 uses nickel-ytttrium and copper materials at the center electrode, with nickel-ytttrium ground electrode tips to support reliable spark delivery under normal driving conditions. Bosch 7402 is a direct-fit style spark plug for many applications that specify a conventional nickel plug rather than platinum or iridium.

This part number is commonly searched as Bosch 7402 spark plug, Bosch Nickel 7402, and Bosch conventional nickel-copper spark plug for BMW 325i, Audi A4, and Volkswagen Golf service. This part cross-references no listed aftermarket part numbers in the provided data.

What It Helps Address

• Hard starting caused by worn spark plug electrodes
• Rough idle from inconsistent ignition firing
• Misfire symptoms related to aged secondary ignition components
• Reduced throttle response from degraded spark delivery
• Maintenance replacement for vehicles calling for a preset-gap nickel plug

Installation Notes

Verify engine application before installation and confirm the vehicle calls for a flat-seat, 14 mm, 19 mm reach spark plug with a preset .9 mm gap. Do not regap this plug. Use the manufacturer-specified torque procedure and inspect ignition wires or coils at the same time, especially on higher-mileage Audi, BMW, Saab, Suzuki Verona, and Volkswagen models.

For fitment, Bosch 7402 is listed for applications such as 2004-2006 Suzuki Verona, 1998-2001 Volkswagen Beetle, 1999-2001 Volkswagen Golf, 1999-2001 Volkswagen Jetta, 1996-1999 Audi A4, 1991-1999 BMW 318i, 1997-1999 Porsche Boxster, and 1998-1999 Volkswagen Passat.

Quality Assurance

Bosch designs this nickel-copper spark plug to meet or exceed original equipment specifications for the listed spark plug type. The conventional construction, resistor design, and OE-style dimensions support dependable replacement service across the confirmed fitment range.