Denso 5071 Spark Plug

Denso Double Platinum Spark Plug 5071

Denso Double Platinum spark plug 5071 is built for OE-level ignition performance, durability, and emissions control. It is a direct-fit spark plug for a wide range of Chevrolet, GMC, Buick, Pontiac, Oldsmobile, and Cadillac applications, including Silverado 2500 HD, Sierra 3500, and Avalanche 2500 models.

The Double Platinum line is designed for long service life in distributorless ignition systems, with platinum on the center electrode and a platinum chip ground tip for stable spark delivery and reduced wear. If you are replacing worn plugs in a Chevrolet Silverado 2500 HD or GMC Sierra 2500 HD, this Denso 5071 plug is built to match the original equipment style and heat range requirements.

Key Features

• Double Platinum design with platinum center electrode tip and platinum chip ground tip
• Copper center electrode core and nickel ground electrode core for reliable conductivity
• 5000 ohm resistor for ignition noise suppression
• Pre-gapped to 1.5 mm
• Tapered seat, 14 mm thread diameter, 18.00 mm reach, and 16.0 mm hex size
• Manufacturer heat range 14 for OE-style thermal control
• Direct replacement spark plug for select GM truck, van, and passenger car applications

Product Details

Denso 5071 is a secondary ignition spark plug engineered to meet strict OE performance, durability, and emissions standards. The Double Platinum construction helps maintain consistent firing characteristics over time, while the platinum chip ground electrode and platinum center tip are suited to applications that call for long-life platinum plugs. This part cross-references Denso Auto Parts TJ14R-P15 and General Motors 12578277 for the same application.

What This Spark Plug Helps Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from weak or inconsistent spark output
• Misfire conditions related to electrode wear
• Reduced fuel economy from degraded ignition performance
• Emissions issues tied to aging ignition components

Installation Notes and Fitment

Compatible with select GM applications. Fits 2002-2006 Chevrolet Avalanche 2500, N/A; 2006 Chevrolet Silverado 2500 HD, N/A; 2001-2004 Chevrolet Silverado 2500 HD, N/A; 2006 Chevrolet Silverado 3500, N/A; 2001-2002 Chevrolet Silverado 3500, N/A; 2001-2006 Chevrolet Suburban 2500, N/A; 2001-2006 GMC Sierra 2500 HD, N/A; 2001-2006 GMC Sierra 3500, N/A; 2001-2006 GMC Yukon XL 2500, N/A; 2001-2002 Chevrolet Express 3500, N/A; 2001-2002 GMC Savana 3500, N/A; 1995-1997 Chevrolet Cavalier, N/A; 1995-1997 Pontiac Sunfire, N/A; 1995-1996 Buick Century, N/A; 1995-1996 Chevrolet Corsica, N/A; 1995-1996 Oldsmobile Cutlass Ciera, N/A; 1994-1995 Chevrolet S10, N/A; 1993 Chevrolet Lumina, N/A.

Verify thread diameter, reach, seat type, and heat range before installation. Use the specified gap as supplied, and follow the vehicle service manual for torque and ignition system procedures.

Quality Assurance

Denso manufactures this spark plug to OE performance, durability, and emissions standards, with specifications aligned to original equipment requirements for the listed applications.