Denso 3128 Spark Plug

Denso Double Platinum Spark Plug 3128

Denso Double Platinum spark plug 3128 is built for OE-style ignition performance, durability, and emissions control. It uses a platinum chip ground electrode, platinum center electrode tip, and a copper core to support consistent spark delivery in a wide range of Toyota, Lexus, Scion, and select Mercedes-Benz applications.

The Double Platinum line is Denso’s premium spark plug family for drivers who want a direct-fit replacement with stable ignition characteristics and long service life. For vehicles such as the Toyota Camry, Toyota Corolla, and Lexus RX330, this plug is a practical choice when you need factory-style fitment and dependable secondary ignition performance.

Key Features

• Part number 3128 from Denso Double Platinum
• Platinum chip ground electrode design for durable spark performance
• Platinum center electrode tip with copper core construction
• 5000 ohm resistor for ignition noise suppression
• Flat seat design with 14.00 mm thread diameter and 19.00 mm reach
• Pre-gapped to 1.1 mm for OE-style installation
• Compatible with a broad range of Toyota, Lexus, Scion, Volvo, Mercedes-Benz, Pontiac, Chrysler, and Suzuki applications

Detailed Description

Denso 3128 is engineered to meet strict OE performance, durability, and emissions standards. The platinum-on-platinum design helps maintain stable firing characteristics over time, while the nickel ground electrode core and copper center core support efficient heat transfer and reliable ignition. With a 16.0 mm hex size and manufacturer heat range 20, this spark plug is built for direct replacement use in many late-model and older import applications.

Cross-reference part numbers include DENSO Auto Parts PK20R11 and Toyota 90919-01178 for the same application. Fits 2002-2011 Toyota Camry, N/A; Fits 2005-2006 Toyota Corolla, N/A; Fits 2004-2006 Lexus RX330, N/A.

What It Helps Address

• Rough idle caused by worn spark plugs
• Hard starting from weak or inconsistent spark output
• Misfire conditions tied to aged secondary ignition components
• Reduced fuel economy from inefficient combustion
• Emissions issues related to degraded plug performance

Installation Notes and Tips

Verify the vehicle application against the fitment list before installation. Check the pre-gap specification against your engine requirements and inspect coil boots, plug wires, and ignition coils for wear at the same time. On applications such as the Mercedes-Benz SLK55 AMG and CLK55 AMG, the fitment notes indicate two spark plugs are required per cylinder; follow the vehicle service procedure for the correct configuration. Use the specified torque and thread engagement for the 14.00 mm flat-seat design.

Quality Assurance

Denso manufactures this spark plug to OE-level performance, durability, and emissions standards. The Double Platinum construction is designed for consistent ignition performance across the listed applications, including Toyota Matrix, Lexus HS250h, and Scion xB fitments.