Denso 3485 Spark Plug

Denso Iridium Long Life Spark Plug for Prius C

The Denso 3485 spark plug is an OE-style ignition component built for the Toyota Prius C platform. It uses an iridium center electrode with a platinum needle ground tip to support stable spark performance and long service life in secondary ignition systems.

Key Features

• Iridium center electrode tip for consistent ignition performance
• Platinum needle ground electrode tip with needle-to-needle configuration
• Copper center electrode core and nickel ground electrode core
• Pre-gapped to 0.8 mm for the specified application
• 5000 ohm resistance for ignition circuit control
• Flat seat design, 14.00 mm thread diameter, 19.00 mm reach, and 16.0 mm hex size
• Manufactured to meet strict OE performance, durability, and emissions standards

Product Details

Denso Iridium Long Life (SIP) spark plugs are engineered for drivers who want OE-level ignition performance and durability in a direct-fit replacement. Part number 3485 is listed for 2012-2018 Toyota Prius C and 2019 Toyota Prius C applications, making it a focused choice for Prius C maintenance and tune-up service. This part cross-references DENSO Auto Parts FK16R-A8 and Toyota 90919-01265 for the same application.

For buyers searching for a Toyota Prius C spark plug, Denso 3485 provides the correct thread diameter, reach, seat type, and pre-gap specification needed for the listed vehicles. The iridium tip helps maintain a precise spark point, while the platinum needle ground design supports long-term wear resistance in everyday driving.

Common Issues This Part Addresses

• Rough idle caused by worn spark plugs
• Hard starting from weakened ignition output
• Misfire conditions related to plug wear
• Reduced fuel economy from inconsistent combustion
• Loss of throttle response from degraded spark performance

Installation Notes and Tips

Verify engine application by year before installation. Confirm the 14.00 mm thread diameter, 19.00 mm reach, flat seat, and 0.8 mm pre-gap match the vehicle specification. Handle iridium and platinum electrode tips carefully during installation to avoid damage, and follow the vehicle manufacturer’s torque and service procedures.

Quality Assurance

Denso manufactures this spark plug to OE performance, durability, and emissions standards. The Iridium Long Life (SIP) line is built for direct replacement service in specified Toyota Prius C applications, including 2012-2018 and 2019 model years.