Denso 3122 Spark Plug

Reliable Ignition Performance for Lexus, Toyota, and More

The Denso 3122 spark plug from the U-Groove Conventional line offers consistent ignition performance for a range of vehicles including Lexus LS400, Toyota Celica, and Mitsubishi Montero. Designed with precision materials and a unique U-groove ground electrode tip, this spark plug supports efficient combustion and engine reliability.

• U-groove ground electrode tip design for improved spark exposure
• Nickel ground electrode and center electrode tip for durability
• Copper center electrode core for optimal conductivity
• Standard ground configuration with a single ground electrode
• Flat seat type with 14mm thread diameter and 19mm reach
• Pre-gap size of 0.8 mm for precise ignition timing
• Hex size of 16.0 mm for easy installation
• Manufacturer heat range of 20 suitable for various engine conditions
• Resistance of 5000 ohms to reduce electrical noise interference

About the Denso U-Groove Conventional Spark Plug Line

The U-Groove Conventional spark plug line by Denso features a distinctive U-shaped groove on the ground electrode tip. This design increases the spark exposure area, promoting better ignition and combustion efficiency. The conventional construction balances durability and performance, making it suitable for a variety of secondary ignition applications in vehicles such as the Mercedes-Benz CL65 AMG and Nissan Quest.

Technical Details and Compatibility

The Denso 3122 spark plug is engineered with a copper core center electrode to enhance thermal conductivity and electrical performance. The nickel material used for both the ground electrode tip and center electrode tip ensures resistance to wear and corrosion. With a flat seat and a 19 mm reach, this spark plug fits securely in compatible engines. Its 5000 ohm resistance helps minimize radio frequency interference, supporting stable engine operation.

Common Applications and Problem Solving

• Compatible with Lexus LS400, Toyota Corolla, Mitsubishi Montero, Nissan Quest, and Mercedes-Benz S65 AMG models
• Addresses misfires caused by worn or damaged spark plugs
• Helps restore engine smoothness and fuel efficiency
• Reduces ignition noise and electrical interference
• Supports consistent combustion in high-performance and daily driving conditions

Installation Notes and Tips

Before installation, verify the spark plug gap is set to 0.8 mm as specified. Use a 16 mm socket wrench to tighten the spark plug to the manufacturer’s recommended torque. Ensure the flat seat type matches the engine’s cylinder head design to prevent compression leaks. It is advisable to inspect the ignition system components for wear during replacement to maintain optimal performance.

Quality Assurance and Warranty

Denso spark plugs, including the 3122 part number, are manufactured to meet strict quality standards. The use of high-grade materials such as nickel and copper ensures durability and reliable ignition performance. While specific warranty details may vary, Denso products typically come with manufacturer-backed quality assurance to support long-term use in compatible Lexus, Toyota, Mitsubishi, Nissan, and Mercedes-Benz vehicles.