Denso 3174 Spark Plug

Denso Double Platinum Spark Plug 3174

Denso Double Platinum 3174 is a spark plug built for OE-style ignition performance, durability, and emissions control. It uses a double platinum chip ground electrode design, a platinum center electrode tip, and a copper core to support stable spark delivery in a wide range of import and domestic applications.

Compatible With Mercedes-Benz, Mitsubishi, Saturn, Nissan, and other listed applications, this plug is a direct-fit option for drivers searching for a Denso 3174 spark plug, Denso Double Platinum 3174, or an OE replacement spark plug for specific vehicle fitments.

Key Features

• Double Platinum Chip ground electrode design for consistent wear characteristics
• Platinum center electrode tip with copper core for reliable ignition performance
• 5000 ohm resistor helps control electrical noise in the ignition system
• Flat seat design with 14.00 mm thread diameter and 19.00 mm reach
• 1.1 pre-gap size for applications specified to this plug configuration
• OE-focused construction aligned with strict performance, durability, and emissions standards

Product Details

The Denso Double Platinum line is engineered for vehicles that call for a durable platinum spark plug with stable spark characteristics over extended service intervals. Part number 3174 is built with a nickel ground electrode core, a platinum-tipped center electrode, and a standard ground configuration to match the requirements of many late-model and older import vehicles. This part cross-references Denso Auto Parts PK16PR-P11 for the same application.

Vehicle coverage includes applications such as Fits 2005-2006 Mercedes-Benz CLK500, Fits 2005-2006 Mercedes-Benz E500, Fits 1997-2002 Honda Passport, and Fits 1993-2002 Mitsubishi Mirage. It also appears in fitments for Mercedes-Benz CLS500, ML500, S500, and other listed models, making it a useful search match for buyers looking for a Denso 3174 spark plug for Mercedes-Benz CLK500 or Mitsubishi Mirage ignition service.

Common Issues This Part Can Address

• Hard starting caused by worn or inconsistent spark plugs
• Rough idle from degraded ignition performance
• Misfire conditions related to worn electrode surfaces
• Reduced fuel economy from inefficient combustion
• Ignition noise concerns in systems that require resistor plugs

Installation Notes and Tips

Verify the vehicle’s original plug specification before installation, including thread diameter, reach, seat type, and heat range. Confirm the listed fitment for your exact year, make, and model, since some Mercedes-Benz applications note that two spark plugs are required per cylinder. Use proper torque procedures and inspect ignition components such as coils, boots, and wires during service.

Quality Assurance

Denso manufactures this spark plug to OE-level performance, durability, and emissions standards. The Double Platinum design is intended to provide consistent ignition service in applications that specify a platinum-tipped plug with a resistor configuration.