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Bosch 7406 Spark Plug
| Brand | Bosch 7406 |
|---|---|
| Center Electrode Core Material | Nickel-Yttrium and Copper |
| Center Electrode Tip Material | Nickel-Yttrium |
| Ground Configuration | Multiple |
| Ground Electrode Quantity | 4 |
| Ground Electrode Tip Design | Multiple |
| Ground Electrode Tip Material | Nickel-Yttrium |
| Hex Size | 16 |
| Insulator Material | Ceramic |
| Insulator Type | Non-Projected |
| Manufacturer Heat Range | 7 |
| Outdoor Power Equipment Application | No |
| Package Contents | Spark Plug |
| Pre-Gap Size | 1.6 |
| Product Length | 2.929134 in |
| Product Width | 0.748031 in |
| Reach | 19 |
| Resistance | 5000 |
| Resistor | Yes |
| Seat Type | Flat |
| Short Style | No |
| Spark Plug Type | 4-Cycle |
| Thread Diameter | 14 |
| Product line | Nickel |
| Fits | Audi and Volkswagen · 55 vehicles |
OE-spec design. Meets or exceeds original equipment requirements for nickel-copper core spark plugs.
Nickel-copper core. Yttrium-enhanced center electrode helps deliver longer-lasting performance.
Resistor spark plug. Built with a 5,000-ohm resistor for stable ignition performance.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
Bosch Nickel Spark Plug 7406 for OE-Style Ignition Service
Bosch 7406 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, and the preset gap should not be adjusted during installation.
Key Features
- Conventional nickel-copper spark plug for 4-cycle engines
- Nickel-Yttrium center electrode with copper core for extended service life
- Multiple ground electrode design with four ground electrodes
- Preset 1.6 mm gap; do not gap before installation
- 5000 ohm resistor for ignition noise suppression
- Flat seat, 14 mm thread diameter, 19 mm reach, 16 mm hex
- Ceramic insulator with non-projected insulator type
Product Details
The Bosch Nickel line focuses on practical OE-style replacement parts for everyday ignition service. Part number 7406 follows original-equipment specifications for nickel-copper core spark plugs, making it a direct service option for drivers maintaining factory-style ignition performance on Audi A4, Audi A6 Quattro, Audi S4, and related applications. Bosch 7406 is also listed for Audi R8, Audi S5, Audi A8 Quattro, Audi Allroad Quattro, Audi S8, Volkswagen Touareg, and Volkswagen Phaeton applications where the factory plug specification calls for a preset nickel plug.
This spark plug is engineered with a nickel-ytrium center electrode and copper core to support consistent spark delivery and durable service. The multiple ground configuration and resistor design help maintain stable ignition operation in the specified applications. If you are replacing worn plugs in a 2006-2011 Audi A6 Quattro or a 2004-2009 Audi S4, Bosch 7406 provides an OE-style service part that matches the listed fitment and preset gap requirement.
Common Issues It May Address
- Rough idle caused by worn spark plug electrodes
- Hard starting from degraded ignition performance
- Misfire conditions related to aged plugs
- Reduced fuel economy from inconsistent spark delivery
- Ignition noise concerns in resistor-equipped systems
Installation Notes and Tips
Verify engine application before installation and confirm the plug matches the listed OE specification. The gap is preset, so do not gap Bosch 7406 before use. Inspect coil boots, ignition coils, and plug wells during service, and install to the manufacturer’s torque specification for the vehicle.
Fits 2000-2011 Audi A6 Quattro, N/A; Fits 2008-2010 Audi R8, N/A; Fits 2004-2009 Audi S4, N/A; Fits 2006-2008 Audi A4, N/A; Fits 2005-2008 Audi A4 Quattro, N/A; Fits 2008 Audi S5, N/A; Fits 2004-2007 Volkswagen Touareg, N/A; Fits 2000-2006 Audi A8 Quattro, N/A; Fits 2004-2006 Volkswagen Phaeton, N/A; Fits 2003-2005 Audi Allroad Quattro, N/A; Fits 2001-2003 Audi S8, N/A.
Quality Assurance
Bosch designs the Nickel line to meet or exceed original-equipment specifications for nickel-copper core spark plugs. Part number 7406 is built with OE-style dimensions and materials for the listed applications.
| Year | Make | Model | Submodel | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|---|
| 2011 | Audi | A6 Quattro | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2010 | Audi | A6 Quattro | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2010 | Audi | R8 | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2009 | Audi | A6 Quattro | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2009 | Audi | R8 | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2009 | Audi | S4 | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2008 | Audi | A4 | — | 3.2L | V6 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2008 | Audi | A4 Quattro | Base | 3.2L | V6 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2008 | Audi | A4 Quattro | Avant | 3.2L | V6 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2008 | Audi | A6 Quattro | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2008 | Audi | A6 Quattro | Base | 3.2L | V6 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2008 | Audi | R8 | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2008 | Audi | S4 | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2008 | Audi | S5 | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2007 | Audi | A4 | — | 3.2L | V6 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2007 | Audi | A4 Quattro | Base | 3.2L | V6 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2007 | Audi | A4 Quattro | Avant | 3.2L | V6 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2007 | Audi | A6 Quattro | Base | 3.2L | V6 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2007 | Audi | A6 Quattro | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2007 | Audi | S4 | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2007 | Volkswagen | Touareg | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2006 | Audi | A4 | — | 3.2L | V6 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2006 | Audi | A4 Quattro | — | 3.2L | V6 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2006 | Audi | A6 Quattro | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2006 | Audi | A6 Quattro | Base | 3.2L | V6 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2006 | Audi | A8 Quattro | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2006 | Audi | S4 | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2006 | Volkswagen | Phaeton | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2006 | Volkswagen | Touareg | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2005 | Audi | A4 Quattro | — | 3.2L | V6 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2005 | Audi | A6 Quattro | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2005 | Audi | A6 Quattro | — | 3.2L | V6 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2005 | Audi | A8 Quattro | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2005 | Audi | Allroad Quattro | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2005 | Audi | S4 | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2005 | Volkswagen | Phaeton | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2005 | Volkswagen | Touareg | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2004 | Audi | A6 Quattro | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2004 | Audi | A8 Quattro | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2004 | Audi | Allroad Quattro | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2004 | Audi | S4 | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2004 | Volkswagen | Phaeton | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2004 | Volkswagen | Touareg | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2003 | Audi | A6 Quattro | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2003 | Audi | A8 Quattro | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2003 | Audi | Allroad Quattro | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2003 | Audi | S8 | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2002 | Audi | A6 Quattro | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2002 | Audi | A8 Quattro | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2002 | Audi | S8 | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2001 | Audi | A6 Quattro | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2001 | Audi | A8 Quattro | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2001 | Audi | S8 | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2000 | Audi | A6 Quattro | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
| 2000 | Audi | A8 Quattro | — | 4.2L | V8 | N/A | Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; Nickel |
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