Denso 4126 Spark Plug

Reliable Ignition Performance with Denso U-Groove Conventional Spark Plug

The Denso 4126 spark plug delivers consistent ignition performance designed for a range of vehicle applications. Engineered with quality materials and precise specifications, this spark plug supports efficient combustion and engine reliability.

• Resistance: 5000 ohms for optimal electrical performance
• Ground Electrode Tip Design: Standard for reliable spark delivery
• Ground Electrode Core Material: Nickel for durability
• Center Electrode Core Material: Copper to enhance conductivity
• Center Electrode Tip Material: Nickel for wear resistance
• Pre-Gap Size: 0.8 mm for precise spark gap
• Ground Electrode Quantity: Single electrode design
• Hex Size: 16.0 mm for standard installation tools
• Manufacturer Heat Range: 24 suitable for moderate engine temperatures
• Seat Type: Flat for secure sealing
• Reach: 19.00 mm to fit specific cylinder head depths
• Thread Diameter: 14.00 mm matching OEM specifications

About the U-Groove Conventional Product Line

The Denso U-Groove Conventional spark plug line features a unique electrode design that improves ignition efficiency and combustion stability. This product line focuses on conventional spark plug technology with enhancements such as a U-shaped groove on the center electrode tip, which helps to increase the spark area and improve ignition reliability. The 4126 part number is part of this line, offering a balance of durability and performance for compatible vehicles.

Technical Details and Application

The Denso 4126 spark plug is engineered with a copper core center electrode to provide excellent thermal conductivity and efficient heat dissipation. The nickel ground electrode and tip materials contribute to long service life and resistance to electrode wear. With a pre-gap size of 0.8 mm and a single ground electrode, this spark plug is designed to maintain consistent spark gaps and ignition timing. The flat seat type and 14 mm thread diameter ensure proper fitment in engines requiring these specifications.

Common Uses and Problem Solving

• Restores engine misfire issues caused by worn or fouled spark plugs
• Improves cold start performance in compatible vehicles
• Reduces rough idling and hesitation during acceleration
• Maintains fuel efficiency by ensuring proper combustion
• Supports stable engine operation under moderate heat ranges

Installation Notes and Tips

When installing the Denso 4126 spark plug, verify the correct thread diameter and reach to match your engine’s cylinder head specifications. Use a 16 mm socket wrench for proper torque application. Ensure the pre-gap size of 0.8 mm is maintained or adjusted according to the vehicle manufacturer’s recommendations. Avoid over-tightening to prevent damage to the spark plug or cylinder head threads.

Quality Assurance and Warranty

Denso spark plugs are manufactured to meet strict quality standards for durability and performance. The 4126 spark plug undergoes rigorous testing to ensure consistent electrical resistance and heat range compliance. While specific warranty details may vary, Denso products typically come with manufacturer-backed quality assurance to support reliable operation in compatible vehicles.