Champion 404 Spark Plug - Exhaust Side

Champion Copper Plus Spark Plug Overview

The Champion Copper Plus 404 spark plug is engineered for reliable ignition performance across a wide range of vehicles including Audi, BMW, Ford, Toyota, and Volkswagen. Designed with durable nickel and copper alloy materials, this spark plug ensures consistent engine starts and efficient combustion.

• Ground electrode core made of nickel for durability
• Center electrode tip constructed from nickel
• Pre-gap size of 0.035 inches (0.89 mm) for optimal spark
• Flat seat type with a 0.75-inch reach
• Resistor type spark plug to reduce electrical noise
• Thread diameter of 14 mm (0.551 inches) with a hex size of 20.65 mm (0.813 inches)
• Non-removable nut electrical terminal type
• Manufacturer heat range rating of 12

Detailed Product Features and Specifications

The Champion Copper Plus 404 spark plug features a nickel copper alloy ground electrode and a nickel center electrode tip, providing a balance of conductivity and wear resistance. The spark plug’s pre-gap size is precisely set at 0.035 inches (0.89 mm) to ensure efficient ignition and combustion. It has a flat seat design with a 0.75-inch reach, suitable for many passenger and light truck engines. The resistor built into the plug helps minimize radio frequency interference, which is important for modern vehicles with sensitive electronics. The thread diameter measures 14 mm, and the hex size is 20.65 mm, allowing for standard installation tools. This spark plug is classified under the Rn12yc plug type and has an insulator height and projection of 0.12 inches, contributing to its reliable performance under various operating conditions.

About the Champion Copper Plus Product Line

The Copper Plus line from Champion is designed to provide dependable ignition with copper core technology. Copper cores improve heat transfer and electrical conductivity compared to standard plugs, which helps maintain stable engine performance. The Copper Plus spark plugs are suitable for a broad range of vehicles, including many models from Audi, BMW, Ford, Toyota, and Volkswagen, making them a versatile choice for secondary ignition needs.

Compatible Vehicles and Common Applications

• Compatible with Audi, BMW, Ford, Toyota, Volkswagen, and more
• Fits models such as 4Runner, 525i, 911, Camaro, Civic, and Jetta
• Used in passenger cars, light trucks, and SUVs requiring a 14 mm thread spark plug
• Suitable for vehicles needing a heat range 12 spark plug with flat seat design

Common Issues Addressed by Champion Copper Plus 404 Spark Plug

• Engine misfires due to worn or faulty spark plugs
• Hard starting or inconsistent ignition
• Poor fuel efficiency caused by incomplete combustion
• Rough idling or engine hesitation
• Electrical interference affecting vehicle electronics

Installation Notes and Tips

• Ensure the spark plug gap is set to 0.035 inches (0.89 mm) before installation
• Use a 20.65 mm (13/16 inch) socket wrench for proper tightening
• Apply anti-seize compound on threads if recommended by the vehicle manufacturer
• Torque to manufacturer specifications to avoid damage to the spark plug or cylinder head
• Check for proper reach (0.75 inches) to ensure correct fitment in the combustion chamber

Quality Assurance and Warranty

Champion Copper Plus spark plugs are manufactured to meet OEM specifications and undergo rigorous quality control to ensure consistent performance. The 404 spark plug includes a resistor to reduce electrical noise and is built with durable nickel and copper alloy materials for longevity. While specific warranty details may vary, Champion products typically come with a limited warranty against manufacturing defects.