NGK 3546 Spark Plug

NGK Laser Platinum Spark Plug 3546 Overview

NGK Laser Platinum Spark Plug 3546 is an OE-style ignition component built for consistent spark delivery and stable engine operation. It uses a platinum center electrode, nickel ground electrode, and a 0.044 in pre-gap to match the specified service requirements for select Acura and Land Rover applications.

The Laser Platinum line is part of NGK’s OE-focused spark plug range, backed by the company’s long history supplying original equipment and replacement ignition parts for domestic and import vehicles. Part number PFR6N-11 is engineered with a flat seat, 14 mm thread diameter, 5/8 hex, and 0.75 in reach for the listed applications.

Key Features

• Platinum center electrode tip for durable spark performance
• Nickel ground electrode with standard tip and configuration
• 0.044 in pre-gap for the specified OE applications
• 5000 ohm resistance for ignition system compatibility
• Flat seat design with 14 mm thread diameter and 0.75 in reach
• NGK part number 3546, also identified as PFR6N-11

Vehicle Fitment

• Fits 2002-2005 Land Rover Freelander, N/A; spark plug with 0.044" gap, OE equivalent design, 60,000 mile OE manufacturer recommended service interval.
• Fits 2003-2004 Land Rover Discovery, N/A; spark plug with 0.044" gap, OE equivalent design, 60,000 mile OE manufacturer recommended service interval.
• Fits 1999-2002 Land Rover Discovery, N/A; gap 0.044", OE equivalent design, recommended service interval of 30,000 miles by OEM.
• Fits 1995-1996 Acura NSX, N/A; spark plug gap is 0.044 inches per OE specifications.

What This Spark Plug Helps Address

• Hard starting caused by worn or fouled spark plugs
• Misfire conditions related to weak or inconsistent ignition output
• Rough idle from degraded spark plug performance
• Reduced fuel efficiency from incomplete combustion
• Loss of throttle response from aging ignition components

Installation Notes and Tips

Verify the OE gap specification before installation and confirm the plug matches the vehicle’s thread diameter, reach, seat type, and heat range. For the listed Land Rover Discovery, Land Rover Freelander, and Acura NSX applications, use the vehicle’s service information to confirm the correct torque procedure and ignition system requirements. Part number 3546 should be matched to the exact engine application shown in the fitment data.

This part cross-references DENSO Auto Parts 4504 and Anchor 3546 for the same application.

Quality Assurance

NGK is a long-established OE supplier and manufacturer of spark plugs for domestic and import vehicles in North America. The Laser Platinum line reflects NGK’s OE-oriented manufacturing approach, with attention to durability, fit, and operational performance for the listed applications.