NGK 5874 Spark Plug

NGK Laser Platinum Spark Plug for OE-Style Ignition Performance

The NGK Laser Platinum Spark Plug, part number 5874, is built for drivers who want an OE-style replacement with precise ignition characteristics and long service life. It uses a platinum center electrode tip, a copper core, and a standard ground electrode layout to support consistent spark delivery in select Audi applications.

As part of NGK’s Laser Platinum Spark Plug line, this plug is engineered around original equipment standards for durability and stable operation. It is a direct-fit ignition service part for select Audi A4, A4 Quattro, A6, and A6 Quattro models.

Key Features

• Laser Platinum Spark Plug design for OE-style ignition service
• Platinum center electrode tip with copper core construction
• Standard ground electrode configuration with one ground electrode
• Pre-gapped to .044 inch
• 14 mm thread diameter, 5/8 inch hex, and flat seat
• 1000 ohm resistance for ignition system compatibility
• Manufacturer heat range 6
• NGK part number 5874 / PFR6U-11G

Detailed Description

NGK 5874 is a Laser Platinum spark plug designed for select Audi engines that call for a .044 inch gap and a flat-seat plug with a 14 mm thread. The platinum tip helps maintain stable firing characteristics, while the copper core construction supports efficient heat transfer. This makes it a practical OE replacement for routine ignition service on Audi A4, Audi A4 Quattro, Audi A6, and Audi A6 Quattro models.

NGK is a major OE spark plug supplier in North America and manufactures ignition components for a wide range of automotive applications. The 5874 spark plug reflects that OE-focused approach with standardized dimensions, a non-removable nut terminal, and a design intended to match factory-style service requirements. This part cross-references DENSO Auto Parts 4504 for the same application.

Vehicle Fitment

• Fits 2006 Audi A4 Quattro, N/A; Gap 0.044"; Actual OE Manufacturer; 35,000 mi OE Mfr Recommended Service Interval; Laser Platinum Spark Plug
• Fits 2005 Audi A4, N/A; Gap 0.044"; Actual OE Manufacturer; 55,000 mi OE Mfr Recommended Service Interval; Laser Platinum Spark Plug
• Fits 2005 Audi A4 Quattro, N/A; Gap 0.044"; Actual OE Manufacturer; 55,000 mi OE Mfr Recommended Service Interval; Laser Platinum Spark Plug
• Fits 2004 Audi A4, N/A; Gap 0.044"; Actual OE Manufacturer; 35,000 mi OE Mfr Recommended Service Interval; Laser Platinum Spark Plug
• Fits 2004 Audi A4 Quattro, N/A; Gap 0.044"; Actual OE Manufacturer; 35,000 mi OE Mfr Recommended Service Interval; Laser Platinum Spark Plug
• Fits 2004 Audi A6, N/A; Gap 0.044"; Actual OE Manufacturer; 35,000 mi OE Mfr Recommended Service Interval; Laser Platinum Spark Plug
• Fits 2004 Audi A6 Quattro, N/A; Gap 0.044"; Actual OE Manufacturer; 35,000 mi OE Mfr Recommended Service Interval; Laser Platinum Spark Plug
• Fits 2002-2003 Audi A4, N/A; Gap 0.044"; Actual OE Manufacturer; 40,000 mi OE Mfr Recommended Service Interval; Laser Platinum Spark Plug
• Fits 2002-2003 Audi A4 Quattro, N/A; Gap 0.044"; Actual OE Manufacturer; 40,000 mi OE Mfr Recommended Service Interval; Laser Platinum Spark Plug
• Fits 2002-2003 Audi A6, N/A; Gap 0.044"; Actual OE Manufacturer; 40,000 mi OE Mfr Recommended Service Interval; Laser Platinum Spark Plug
• Fits 2002-2003 Audi A6 Quattro, N/A; Gap 0.044"; Actual OE Manufacturer; 40,000 mi OE Mfr Recommended Service Interval; Laser Platinum Spark Plug

Common Issues This Part Can Address

• Worn spark plugs causing rough idle
• Hard starting from degraded ignition performance
• Misfire conditions related to plug wear or gap drift
• Reduced throttle response from inconsistent spark delivery
• Service interval replacement on Audi ignition maintenance

Installation Notes and Tips

Verify the engine application, thread diameter, reach, seat type, and specified gap before installation. This plug is pre-gapped to .044 inch, but the gap should still be checked against the vehicle service specification before use. Use proper spark plug removal and installation procedures to avoid thread damage in the cylinder head.

For Audi A4, A4 Quattro, A6, and A6 Quattro applications, confirm the engine code and OE plug specification before ordering. The part number 5874 is also identified as PFR6U-11G.

Quality Assurance

NGK is a long-established OE spark plug manufacturer with broad coverage across domestic and import vehicle applications. The 5874 Laser Platinum Spark Plug is built to original equipment standards for fit, durability, and operational consistency in the listed Audi applications.