Denso 3499 Spark Plug

Reliable Ignition Performance for Toyota and Lexus Vehicles

The Denso Iridium Long Life spark plug 3499 is engineered to deliver consistent ignition and enhanced durability for select Toyota, Lexus, and Scion models. Designed with advanced materials, this spark plug supports efficient combustion and long-term engine reliability.

• Iridium center electrode tip for improved ignition and wear resistance
• Platinum chip ground electrode tip for stable spark and longevity
• Copper core center electrode for optimal conductivity
• Standard ground configuration with nickel core ground electrode
• Pre-gap size of 1.1 mm for precise spark gap
• Flat seat type with 12 mm thread diameter and 26.5 mm reach
• Hex size of 14.3 mm for easy installation
• Manufacturer heat range rating of 16 for balanced thermal performance
• Resistance of 5000 ohms to reduce electrical noise interference

About the Denso Iridium Long Life Product Line

The Iridium Long Life series by Denso focuses on delivering extended service intervals and reliable ignition performance. Featuring iridium-tipped center electrodes, these spark plugs provide enhanced durability compared to conventional plugs. The combination of iridium and platinum chip technology in the ground electrode ensures stable spark generation and resistance to electrode wear, making it suitable for vehicles requiring consistent ignition under various driving conditions.

Technical Details and Compatibility

This spark plug, part number 3499, is compatible with a range of Toyota, Lexus, and Scion models including the Toyota Corolla, Prius, Prius Plug-In, Prius V, Matrix, iQ, C-HR, and the Lexus CT200h. It is also suitable for Scion models such as the xD and iM. The 12 mm thread diameter and 26.5 mm reach ensure proper fitment in these engines, while the flat seat type maintains a secure seal.

Common Applications and Problem Solving

• Restores engine misfire issues caused by worn or fouled spark plugs
• Improves cold start performance and throttle response
• Reduces ignition system electrical noise with 5000 ohm resistance
• Helps maintain fuel efficiency by ensuring consistent combustion
• Addresses rough idling and hesitation related to spark plug wear

Installation Notes and Tips

• Verify compatibility with your vehicle’s make and model before installation
• Use a torque wrench to tighten the spark plug to manufacturer specifications
• Check and adjust the pre-gap if necessary to maintain the 1.1 mm gap
• Inspect the spark plug threads and cylinder head for damage prior to installation
• Replace spark plugs in sets to ensure balanced engine performance

Quality Assurance and Warranty

Denso spark plugs are manufactured to meet strict quality standards for durability and performance. The Iridium Long Life spark plug 3499 undergoes rigorous testing to ensure consistent ignition and resistance to electrode wear. While specific warranty terms may vary, Denso products typically come with a limited warranty covering defects in materials and workmanship.