Denso 4019 Spark Plug

Denso 4019 U-Groove Spark Plug

Denso 4019 is a conventional spark plug built for steady ignition performance in secondary ignition systems. Its U-Groove ground electrode design helps improve ignitability, supporting more efficient combustion in the right engine application.

Key Features

• U-Groove ground electrode tip design for improved spark exposure
• Standard ground configuration with a single ground electrode
• Copper center electrode core material for dependable conductivity
• Nickel center and ground electrode tip materials
• Pre-gapped to 0.7 mm
• 14.00 mm thread diameter, 12.70 mm reach, and flat seat type
• Manufacturer heat range 16
• 20.6 mm hex size for proper socket fit

Product Details

This Denso U-Groove Conventional spark plug is engineered around a nickel-tipped electrode layout with a copper core center electrode to support consistent spark delivery. The U-shaped ground electrode helps expose the spark kernel more effectively, which can improve ignition quality and engine efficiency in applications that call for Denso 4019. This part cross-references DENSO Auto Parts (e.g., W16FP-U) for the same application.

Common Issues It Can Help Address

• Hard starting caused by worn spark plug electrodes
• Rough idle from weak or inconsistent ignition
• Misfire conditions related to degraded secondary ignition components
• Reduced fuel efficiency from incomplete combustion
• Loss of throttle response from aged spark plugs

Installation Notes and Tips

Verify thread diameter, reach, seat type, and heat range before installation. Use the correct spark plug socket for the 20.6 mm hex size and confirm the gap specification matches the engine requirement if the application calls for a different setting. For fitment-focused searches, this part is commonly sought for Denso 4019 spark plug replacement and Denso 4019 ignition service on vehicles that specify this plug design.

Compatible With select vehicle applications that specify Denso 4019, including make/model searches for Denso spark plug replacement and U-Groove conventional ignition service. Vehicle-specific fitment should be confirmed against the engine’s required plug specification before installation.

Quality Assurance

Denso manufactures this spark plug to OE-style dimensional and material standards for secondary ignition service. The U-Groove Conventional line focuses on practical ignition performance with a conventional plug design and application-specific engineering.