Bosch 7431 Spark Plug

Bosch OE Fine Wire Double Iridium Spark Plug 7431

Bosch 7431 is an OE Fine Wire Double Iridium spark plug built for direct replacement service in select Volkswagen, Audi, and Porsche applications. It combines a fine-wire iridium center electrode with a laser-welded ground electrode to promote consistent ignition performance and long service life.

OE Fine Wire Double Iridium Design

The Bosch OE Fine Wire Double Iridium line focuses on precise spark delivery and durability. This plug uses an ultra-fine iridium-alloy center electrode firing pin, a laser-welded tapered ground electrode, and an iridium-alloy inlay at the ground electrode to maintain stable ignition characteristics over extended service intervals.

• Iridium center electrode tip for efficient spark initiation
• Laser-welded ground electrode with iridium-alloy inlay
• Projected ceramic insulator design
• Resistor plug with 6000 ohm resistance
• Preset .8 mm gap; do not gap before installation
• Flat seat, 12 mm thread diameter, 26.5 mm reach, 16 mm hex

Vehicle Fitment

• Fits 2019-2023 Volkswagen Atlas, N/A
• Fits 2020-2023 Volkswagen Atlas Cross Sport, N/A
• Fits 2018 Volkswagen Atlas, N/A; do not gap, gap is preset; to 02/2018; original center electrode material is iridium
• Fits 2012-2018 Volkswagen Passat, N/A; do not gap, gap is preset; original center electrode material is iridium
• Fits 2006-2010 Volkswagen Passat, N/A; do not gap, gap is preset; original center electrode material is iridium
• Fits 2009-2017 Volkswagen CC, N/A; do not gap, gap is preset; original center electrode material is iridium
• Fits 2007-2017 Volkswagen Touareg, N/A; do not gap, gap is preset; original center electrode material is iridium
• Fits 2007-2010 Audi Q7, N/A; do not gap, gap is preset; original center electrode material is iridium
• Fits 2008-2010 Porsche Cayenne, N/A; do not gap, gap is preset; original center electrode material is iridium
• Fits 2009-2010 Volkswagen Passat CC, N/A; do not gap, gap is preset; original center electrode material is iridium

Common Replacement Uses

• Rough idle caused by worn spark plug electrodes
• Hard starting from weakened ignition output
• Misfire concerns related to plug wear or excessive gap change
• Loss of throttle response from inconsistent spark delivery
• Service replacement for OE-style iridium plug applications

Installation Notes

Verify engine application by year, make, and model before installation. Bosch 7431 is supplied with a preset gap and should not be regapped. Use the correct torque procedure for the cylinder head material and inspect ignition coils, boots, and wiring during service. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Quality Assurance

Bosch OE Fine Wire Double Iridium plugs are engineered for OE-style fitment and consistent ignition performance in demanding daily-driver applications. The double-iridium electrode design is intended to support long service life while maintaining stable spark characteristics in compatible Volkswagen, Audi, and Porsche engines.