Champion 404-1 Spark Plug - Exhaust Side

Champion Copper Plus 404-1 Spark Plug

Champion Copper Plus 404-1 is a standard replacement spark plug built for dependable ignition performance and consistent heat control. Its copper core electrode improves conductivity, while nickel-based electrode materials support steady wear characteristics across a wide range of older import and domestic applications.

Key Features

• Copper core electrode for improved conductivity and heat management
• Nickel center and ground electrode materials for standard replacement service
• Pre-gapped to 0.035 in. for common ignition setups
• Resistor design helps reduce electrical noise
• Flat seat with washer included
• 14 mm thread diameter, 0.750 in. reach, and 20.65 mm hex size
• Champion Copper Plus line for OE-style service replacement

Product Details

The Champion Copper Plus line is built for drivers and technicians who need a straightforward replacement spark plug with familiar service characteristics. Part number 404-1 uses a copper core electrode to help move heat away from the firing tip and maintain stable spark performance, while the nickel center and ground electrode construction supports dependable operation in everyday driving. This plug is listed as RN12YC and uses a non-removable nut terminal, flat seat, and standard replacement grade construction.

Compatible With applications such as 1996-1999 Land Rover Discovery, 1998 Land Rover Range Rover, 1991-1997 Isuzu Rodeo, 1992-1996 Volkswagen EuroVan, and 1986-1995 Dodge Caravan. It also appears in fitment for vehicles including Toyota 4Runner, Toyota Pickup, Mazda 323, Suzuki Samurai, and BMW 735i. This part cross-references Champion Spark Plug 9007 for the same application.

Common Uses

• Restoring weak or inconsistent spark output
• Replacing worn plugs during scheduled tune-up service
• Addressing rough idle caused by aged ignition components
• Improving combustion consistency in higher-mileage engines
• Servicing older vehicles that call for RN12YC-style plugs

Installation Notes

Verify plug type, thread diameter, reach, and seat style before installation. This plug is pre-gapped at 0.035 in., but the gap should still be checked against the vehicle service specification before use. Confirm the correct application for your engine bank or exhaust-side location where listed, such as certain Nissan D21 and Pathfinder fitments. Use proper torque procedures and inspect ignition wires, coils, and boots during replacement.

Quality Assurance

Champion Copper Plus spark plugs are built as standard replacement ignition components with copper core conductivity and nickel electrode construction for consistent service life in the applications listed above.