Bosch 9694 Spark Plug

Bosch OE Fine Wire Double Iridium Spark Plug

Bosch 9694 is an OE-style fine wire double iridium spark plug built for direct replacement in a wide range of Honda, Nissan, Subaru, and Mercedes-Benz applications. It combines a fine-wire iridium center electrode with a laser-welded ground electrode to support consistent ignition performance and long service life.

The OE Fine Wire Double Iridium line is Bosch’s premium spark plug family for drivers who want OE-level fit and durable electrode construction. Bosch 9694 is engineered around precise ignition demands, including preset gap design and a resistor layout for stable operation in modern 4-cycle engines.

Key Features

• Fine-wire iridium center electrode for strong ignitability
• Double iridium construction with laser-welded ground electrode
• Preset gap design; do not gap before installation
• Resistor spark plug with 6000 ohm resistance
• Projected ceramic insulator design
• 12 mm thread diameter, 14 mm hex size, flat seat
• OE Fine Wire Double Iridium product line
• Part number 9694

Detailed Description

Bosch 9694 uses an iridium-alloy center electrode firing pin and a laser-welded ground electrode with iridium alloy inlay to promote reliable spark delivery and durability. The ultra-fine wire design helps concentrate the spark for efficient ignition, while the copper-core ground electrode and nickel-y yttrium/copper center core support heat transfer and stable performance. This spark plug is a direct-fit option for many Honda Accord, Honda CR-V, Honda Insight, Honda Clarity, Honda Fit, Nissan Sentra, Nissan Altima, Nissan Rogue, Subaru Forester, Subaru Impreza, Subaru Outback, and Mercedes-Benz AMG applications listed in the fitment data. Bosch 9694 is a practical OE replacement choice when you need the correct heat range, preset gap, and original-style spark plug construction for modern gasoline engines.

Common Issues This Spark Plug Can Address

• Hard starting caused by worn spark plug electrodes
• Rough idle from inconsistent ignition output
• Misfire conditions related to aged plugs
• Reduced throttle response from degraded spark quality
• Maintenance replacement for high-mileage ignition service

Installation Notes and Tips

Install Bosch 9694 only in applications listed in the fitment data. The gap is preset, so do not adjust it before installation. Verify the engine calls for a 12 mm thread, 14 mm hex, flat seat, and the specified heat range before service. For Subaru applications in the fitment list, follow the note that the plug is preset and should not be gapped. Use proper torque procedures and inspect ignition coils, boots, and wiring during spark plug replacement.

Quality Assurance

Bosch OE Fine Wire Double Iridium plugs are built to OE-style specifications with laser-welded electrode construction and iridium materials selected for long-term ignition performance. Part number 9694 is engineered for direct replacement use in the confirmed vehicle applications shown above.