Denso 3201 Spark Plug

Denso 3201 U-Groove Spark Plug Overview

Denso 3201 is a conventional spark plug built for direct ignition service in a wide range of Asian vehicles. Its U-Groove electrode design is engineered to improve ignitability, helping support more efficient combustion in everyday driving.

Use this Denso U-Groove Conventional spark plug when servicing applications such as the Kia Optima, Hyundai Sonata, Hyundai Santa Fe, Mitsubishi Mirage, and Nissan Sentra. The Denso 3201 combines a copper core center electrode with nickel tip materials for dependable secondary ignition performance.

Key Features

• U-Groove ground electrode tip design for improved ignitability
• Conventional spark plug construction for OE-style service replacement
• 5000 ohm resistance for standard ignition system operation
• Copper core center electrode for stable heat transfer
• Nickel center and ground electrode tip materials
• Pre-gapped to 1.1 mm
• Flat seat, 14.00 mm thread diameter, 19.00 mm reach
• 20.6 mm hex size for standard spark plug service tools

Product Details

The Denso U-Groove Conventional line focuses on practical ignition performance for vehicles that call for a traditional spark plug design. On part number 3201, the U-shaped ground electrode helps expose the spark kernel more effectively than a standard flat-edge design, which supports consistent firing in applications that rely on precise secondary ignition. This spark plug is listed for 1983-2006 model-year coverage across 68 vehicle applications, including Mitsubishi 3000GT, Mazda B2200, Mazda 323, Hyundai Sonata, Kia Optima, and Nissan Pulsar NX.

This part cross-references DENSO Auto Parts W16EPR-U11 for the same application.

Common Issues This Part Can Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from weak or inconsistent spark delivery
• Misfire symptoms related to aged secondary ignition components
• Reduced throttle response from degraded plug performance
• Service intervals due for conventional ignition maintenance

Installation Notes and Tips

Verify thread diameter, reach, seat type, and heat range before installation. The Denso 3201 uses a flat seat, 14.00 mm thread diameter, 19.00 mm reach, and manufacturer heat range 16, so matching the engine specification is important for correct operation. Check the pre-gap against the vehicle service information before installing, and inspect ignition wires, coils, and plug wells for wear or contamination during service.

Quality Assurance

Denso is an established ignition component manufacturer, and the U-Groove Conventional design is built to deliver reliable spark plug service for specified Kia, Hyundai, Mitsubishi, Mazda, and Nissan applications. Confirm fitment by year, make, and model before ordering, including applications such as 2001-2006 Kia Optima, 2002-2004 Hyundai Sonata, and 1985-1988 Nissan Sentra.