Bosch 7404 Spark Plug

Bosch Nickel Spark Plug 7404 Overview

Bosch 7404 is a conventional nickel-copper spark plug built for steady ignition performance and value. It uses a yttrium-enhanced nickel center electrode with a copper core, plus a projected ceramic insulator and resistor design for dependable secondary ignition service.

Compatible With select BMW, Saab, Volkswagen, and Suzuki applications, including BMW 325i, BMW 525i, Saab 900, Volkswagen Passat, and Suzuki Forenza fitments listed below. Bosch Nickel spark plugs are engineered to meet or exceed original equipment specifications for nickel-copper core spark plug applications.

Key Features

• Bosch part number 7404
• Conventional nickel-copper spark plug design
• Nickel-yttrium center electrode with copper core
• Resistor plug with 6000 resistance
• Projected ceramic insulator for stable combustion chamber exposure
• Flat seat, 14 mm thread diameter, 19 mm reach, and 16 mm hex size
• Multiple ground electrode design with two ground electrodes
• Pre-gapped from the factory; do not gap during installation

Detailed Description

This Bosch Nickel spark plug is built for drivers who need a direct replacement ignition component with OE-style dimensions and materials. The nickel-yttrium center electrode and copper core support consistent spark delivery, while the multiple ground electrode configuration helps maintain reliable ignition performance in the listed applications. Bosch 7404 is a practical choice for older BMW, Saab, Volkswagen, and Suzuki engines that call for a conventional nickel-copper spark plug.

The Bosch Nickel line focuses on dependable everyday operation and OE specification alignment rather than exotic materials. For vehicles such as the BMW 328i, BMW 528i, Saab 9000, Volkswagen EuroVan, and Suzuki Forenza, this plug matches the factory-style format used in many original ignition setups. Part number 7404 is also a useful reference when searching for Bosch 7404 spark plug replacement options.

What It Helps Address

• Misfires caused by worn or fouled spark plugs
• Hard starting from weak ignition output
• Rough idle related to aged secondary ignition components
• Reduced throttle response from inconsistent spark delivery
• Maintenance replacement for factory-style nickel-copper plug applications

Installation Notes and Tips

• Do not gap this spark plug; the gap is preset.
• Verify the vehicle’s under-hood specification label before installation, especially on applications with gap notes.
• Confirm thread diameter, reach, seat type, and heat range match the engine specification.
• Use the listed fitment notes for city-driving and preset-gap applications where shown.
• Check the ignition system condition if the old plugs show heavy wear, oil fouling, or carbon buildup.

Quality Assurance

Bosch designs this Nickel spark plug to meet or exceed original equipment specifications for nickel-copper core spark plug applications. The Bosch 7404 is built with a heavy-duty yttrium-enhanced nickel center electrode and copper core construction for consistent service in the listed fitments.

• Fits 2004-2008 Suzuki Forenza, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel
• Fits 2001 Volkswagen EuroVan, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel
• Fits 2000 BMW 328Ci, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; Nickel
• Fits 1999 BMW 328is, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; Nickel
• Fits 1996-1998 BMW 328i, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel
• Fits 1996-1998 BMW 328is, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel
• Fits 1997-1998 BMW 528i, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel
• Fits 1997-1998 BMW Z3, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel
• Fits 1994-1997 Saab 900, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel
• Fits 1995-1997 Saab 9000, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel
• Fits 1992-1995 BMW 325i, N/A; Do Not Gap, Gap is Preset; For City Driving; Original Center Electrode Material is Copper/Nickel; Nickel
• Fits 1992-1995 BMW 325is, N/A; Do Not Gap, Gap is Preset; For City Driving; Original Center Electrode Material is Copper/Nickel; Nickel
• Fits 1992-1995 BMW 525i, N/A; Do Not Gap, Gap is Preset; For City Driving; Original Center Electrode Material is Copper/Nickel; Nickel
• Fits 1993-1994 Volkswagen Passat, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel
• Fits 1993 BMW 325i, N/A; Check Specification Under Hood for Gap Settings; Do Not Gap, Gap is Preset; For City Driving; Original Center Electrode Material is Copper/Nickel; Nickel
• Fits 1993 BMW 525iT, N/A; Do Not Gap, Gap is Preset; For City Driving; Original Center Electrode Material is Copper/Nickel; Nickel
• Fits 1992-1993 Volkswagen Corrado, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel
• Fits 1991 BMW 525i, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel