Denso 4155 Spark Plug

Reliable Ignition Performance with Denso U-Groove Conventional Spark Plug

The Denso 4155 spark plug delivers consistent ignition performance designed for vehicles requiring a multi-electrode configuration. Engineered with durable materials, this spark plug supports efficient combustion and reliable engine operation.

• Resistance: 5000 ohms for optimal electrical performance
• Multi-electrode ground configuration with 2 ground electrodes
• Nickel ground electrode core and tip for durability
• Copper center electrode core with nickel tip for effective heat transfer
• Pre-gap size of 0.7 mm for precise spark gap
• Flat seat type with 14 mm thread diameter and 19 mm reach
• Hex size of 16.0 mm for standard installation tools
• Manufacturer heat range rating of 27

About the Denso U-Groove Conventional Product Line

The U-Groove Conventional line from Denso focuses on spark plugs featuring a unique multi-electrode design that enhances ignition reliability and combustion efficiency. This product line is tailored for applications where consistent spark delivery and electrode durability are critical, making the 4155 part a suitable choice for various automotive secondary ignition systems.

Technical Details and Application

The Denso 4155 spark plug incorporates a multi-electrode ground configuration with two nickel ground electrodes and a copper core center electrode tipped with nickel. This combination supports effective heat dissipation and stable spark generation. The 0.7 mm pre-gap size ensures optimal ignition timing, while the flat seat and 14 mm thread diameter provide compatibility with many vehicle engines. The 19 mm reach and 16 mm hex size facilitate straightforward installation and secure fitment.

Common Uses and Problem Solving

• Restores engine misfire issues caused by worn or damaged spark plugs
• Improves fuel combustion efficiency in compatible vehicles
• Reduces ignition system electrical noise with 5000 ohm resistance
• Addresses rough idling and poor acceleration symptoms
• Supports stable engine performance under varied operating conditions

Installation Notes and Tips

Ensure the spark plug gap is set to the specified 0.7 mm pre-gap before installation. Use a 16 mm socket wrench for proper tightening torque to avoid damage to the flat seat threads. Verify compatibility with your vehicle’s make and model by cross-referencing the Denso 4155 part number and specifications. Avoid over-tightening to maintain thread integrity and ensure proper sealing.

Quality Assurance and Warranty

Denso spark plugs, including the 4155 model, are manufactured to meet strict quality standards for durability and performance. The use of nickel and copper materials in electrode construction supports long service life. While specific warranty details are not provided here, Denso products typically come with manufacturer-backed quality assurance to support reliable operation in automotive ignition systems.