Denso 3143 Spark Plug

Denso 3143 Spark Plug Overview

Denso 3143 is a U-Groove Conventional spark plug built to OEM quality standards for a wide range of import and luxury vehicles. It uses a copper center electrode core, nickel center tip, and nickel ground electrode for dependable ignition performance in everyday driving.

This Denso spark plug is a direct-fit option for many Hyundai, Kia, Mercedes-Benz, Honda, and Nissan applications, including models such as the Hyundai Sonata, Kia Sorento, and Mercedes-Benz E320. The Denso 3143 is also cross-referenced to DENSO Auto Parts K16PR-L11 for the same application.

Key Features

• U-Groove Conventional design for consistent spark exposure
• Manufactured to OEM quality standards
• Copper center electrode core for stable conductivity
• Nickel center and ground electrode tip materials
• Standard ground configuration with a single ground electrode
• 5000 ohm resistance
• Flat seat, 14.00 mm thread diameter, 19.00 mm reach
• Pre-gapped to 1.1 mm

Product Details

The Denso U-Groove Conventional line focuses on straightforward OE-style ignition service for engines that call for a standard copper-core spark plug. Part number 3143 is built with a 16 mm hex size and heat range 16, making it a practical replacement choice where factory-style plug dimensions and ignition characteristics matter. It is listed across many fitments, including 2006-2010 Hyundai Sonata, 2007-2009 Kia Sorento, and 1999-2004 Mercedes-Benz E320 applications.

Common Uses

• Restoring weak or inconsistent spark output
• Addressing rough idle or misfire-related drivability concerns
• Replacing worn plugs with eroded electrodes
• Correcting hard-start or extended-crank complaints tied to ignition wear
• Maintaining factory-style ignition service on compatible Hyundai, Kia, Mercedes-Benz, and Honda models

Installation Notes

• Verify engine application by year, make, model, and notes before ordering.
• Check the specified gap against the engine requirement before installation.
• Use the correct torque procedure for the cylinder head material and plug seat type.
• Some Mercedes-Benz applications note that two spark plugs are required per cylinder; follow the vehicle service information for the exact engine.
• Confirm thread diameter, reach, and seat type match the original plug.

Quality Assurance

Denso manufactures this spark plug to OEM quality standards for consistent fit and service performance. The 3143 is engineered as a conventional replacement plug for confirmed applications across the listed vehicle coverage, including Hyundai Veracruz, Kia Sedona, and Mercedes-Benz S500 fitments.