Bosch 7406 Spark Plug

Overview of Bosch Nickel Spark Plug 7406

The Bosch Nickel Spark Plug 7406 is engineered for reliable ignition performance in select Audi and Volkswagen models. Designed with a nickel-yttrium center and ground electrode, this spark plug supports efficient combustion and consistent engine operation.

• Resistance: 5000 ohms for noise suppression
• Multiple ground electrode tips and configurations
• Pre-gap size of 1.6 mm for optimal spark
• Four ground electrodes for enhanced spark distribution
• Hex size: 16 mm for standard installation tools
• Manufacturer heat range: 7 suitable for moderate engine temperatures
• Flat seat type and 19 mm reach for proper fitment
• Thread diameter: 14 mm
• Center electrode core and tip made of nickel-yttrium and copper
• Ceramic non-projected insulator for durability
• Designed for 4-cycle engines

About the Bosch Nickel Product Line

The Bosch Nickel line focuses on spark plugs with nickel-yttrium electrode materials, providing a balance of durability and conductivity. This line is tailored for vehicles requiring reliable secondary ignition components that maintain consistent performance under typical driving conditions. The 7406 spark plug exemplifies this with its multi-electrode design and ceramic insulator, ensuring stable ignition in compatible Audi and Volkswagen models.

Detailed Product Description

The Bosch Nickel Spark Plug 7406 features a 5000-ohm resistor to reduce electromagnetic interference, protecting vehicle electronics. Its multiple ground electrode tips and configurations improve spark efficiency and combustion stability. The 1.6 mm pre-gap size and four ground electrodes contribute to consistent ignition, which is critical for smooth engine operation. The spark plug’s 16 mm hex size and 14 mm thread diameter ensure compatibility with standard tools and engine designs. The ceramic non-projected insulator enhances heat resistance and durability, while the flat seat type and 19 mm reach provide a secure fit in the combustion chamber.

Compatible Vehicles and Applications

• Compatible with Audi models: A4, A4 Quattro, A6 Quattro, A8 Quattro, Allroad Quattro, R8, S4, S5, S8
• Compatible with Volkswagen models: Phaeton, Touareg
• Designed for 4-cycle engines requiring nickel electrode spark plugs

Common Issues Addressed by Bosch Spark Plug 7406

• Engine misfires due to worn or faulty spark plugs
• Reduced fuel efficiency from inconsistent ignition
• Difficulty starting the engine in cold or damp conditions
• Increased emissions caused by incomplete combustion
• Interference with vehicle electronics from spark plug noise

Installation Notes and Tips

• Ensure the spark plug gap is set to 1.6 mm before installation
• Use a 16 mm socket wrench for proper torque application
• Verify the flat seat type matches the engine’s cylinder head design
• Apply anti-seize compound sparingly on threads if recommended by the vehicle manufacturer
• Replace spark plugs in sets to maintain balanced engine performance

Quality Assurance and Warranty

Bosch manufactures the Nickel Spark Plug 7406 to meet OEM specifications for fit, form, and function. The use of nickel-yttrium and copper materials in the electrodes ensures durability and consistent conductivity. While specific warranty details may vary, Bosch products typically come with a limited warranty covering defects in materials and workmanship. Always consult vehicle and product documentation for exact warranty terms.