Bosch 7401 Spark Plug

Reliable Ignition Performance for Audi, Volkswagen, and Volvo

The Bosch Nickel 7401 spark plug is engineered to deliver consistent ignition performance for select Audi, Volkswagen, and Volvo models. Designed with durable materials and precise specifications, this spark plug supports efficient combustion and engine reliability.

• Resistance: 5000 ohms for optimal electrical noise suppression
• Multiple ground electrode tips and configurations for improved spark distribution
• Pre-gap size of 1.35 mm for precise ignition timing
• Four ground electrodes to enhance spark exposure
• Flat seat type with 14 mm thread diameter and 19 mm reach
• Center and ground electrode tips made of nickel-yttrium for durability
• Ceramic non-projected insulator for heat resistance and electrical insulation
• Hex size 16 mm for standard installation tools
• Manufacturer heat range 7 suitable for moderate engine temperatures

About the Bosch Nickel Spark Plug Line

The Bosch Nickel product line focuses on spark plugs with nickel-yttrium alloy electrodes, providing a balance of durability and conductivity. The Nickel 7401 spark plug features a combination of nickel-yttrium and copper in the center electrode core, enhancing thermal conductivity and wear resistance. This line is designed for 4-cycle engines, making it suitable for a range of automotive applications including the specified Audi, Volkswagen, and Volvo models.

Technical Details and Compatibility

The Bosch 7401 spark plug is compatible with various Audi models such as the A4, A4 Quattro, A6, and A6 Quattro, Volkswagen models including the Passat and S4, and Volvo models like the S60, S70, S80, S90, V70, and V90. Its 14 mm thread diameter and 19 mm reach ensure proper fitment and sealing in these engines. The flat seat design and 16 mm hex size facilitate straightforward installation and maintenance.

Common Applications and Problem Solving

• Restores consistent engine ignition and smooth idling
• Reduces misfires caused by electrode wear or corrosion
• Improves fuel efficiency by ensuring complete combustion
• Minimizes electrical interference with a 5000 ohm resistor
• Supports engine performance in moderate heat range conditions

Installation Notes and Tips

Before installation, verify the spark plug gap is set to 1.35 mm as specified. Use a 16 mm socket wrench for proper torque application. Ensure the flat seat spark plug is seated evenly to prevent compression leaks. It is recommended to replace all spark plugs simultaneously to maintain balanced engine performance.

Quality Assurance and Warranty

Bosch spark plugs, including the Nickel 7401, are manufactured to meet OEM standards for durability and performance. The use of nickel-yttrium alloy electrodes and ceramic insulators ensures long service life under normal operating conditions. Bosch typically offers a limited warranty on their ignition components; please refer to Bosch's official documentation for specific warranty details.