NGK 5809 Spark Plug

NGK Laser Platinum Spark Plug 5809

NGK Laser Platinum Spark Plug 5809 is an OE-style ignition component built for consistent spark delivery and dependable secondary ignition performance. It uses a platinum center electrode tip, a nickel ground electrode, and a copper core to support stable operation in the applications listed below.

Key Features

• Laser Platinum spark plug from NGK
• Platinum center electrode tip material for durable spark performance
• Copper core center electrode for efficient heat transfer
• Nickel ground electrode with standard tip design
• 5000 ohm resistance
• 14 mm thread diameter, 5/8 hex size, tapered seat
• Pre-gapped at .052 in.
• OE-equivalent design for listed Ford Focus applications

Product Details

NGK part number 5809, also identified as TR6AP-13, is part of the Laser Platinum line, which focuses on OE-level fit and consistent ignition performance. NGK has long supplied original equipment spark plugs for domestic and import vehicles in North America, and this plug reflects that manufacturing background with a tapered seat, non-removable nut terminal, and standard ground configuration. It is listed for 2006-2010 Ford Focus applications, including 2006-2008 Ford Focus and 2009-2010 Ford Focus, with the specified .052 in. gap and OE-equivalent design notes. This part cross-references Monroe Shocks & Struts 5809 for the same application.

Common Issues This Part Can Address

• Rough idle caused by worn spark plug electrodes
• Hard starting from weak or inconsistent ignition output
• Misfire conditions related to plug wear or gap drift
• Reduced fuel economy from inefficient combustion
• Loss of throttle response from degraded spark delivery

Installation Notes and Tips

Verify the engine application before installation and confirm the specified .052 in. gap for the listed Ford Focus fitments. Use the correct 5/8 hex spark plug socket, and inspect the ignition system, coil boots, and plug wells before installing the new plug. The tapered seat and 14 mm thread diameter should match the cylinder head specification for the confirmed application.

Quality Assurance

NGK is a major OE spark plug supplier with extensive North American manufacturing and distribution support. Part number 5809 is built to OE-equivalent standards for the listed Ford Focus applications and reflects NGK’s focus on durability and operational consistency.