Denso 673-6003 Direct Ignition Coil

Denso 673-6003 Direct Ignition Coil

Denso 673-6003 is a direct ignition coil built for coil-on-plug applications that require a 12-volt, black ignition coil. It is a fitment-based replacement for select Ford, Lincoln, and Mercury vehicles, including 2004-2008 Ford F-150 and 2005-2008 Ford Expedition applications.

Key Features

• Direct ignition coil for coil-on-plug systems
• 12-volt electrical specification
• Black housing and boot design
• Built by Denso’s Coil on Plug product line
• Application-specific fitment for select Ford, Lincoln, and Mercury models

Product Details

Denso’s Coil on Plug line focuses on stick-coil ignition technology, with testing and inspection processes used to maintain consistent coil quality. Part number 673-6003 is a direct ignition coil for vehicles that use a coil-on-plug setup, where the coil mounts directly over the spark plug for efficient spark delivery. This part cross-references Motorcraft DG 511 for the same application.

Compatible With select 2004-2008 Ford F-150, 2005-2008 Ford Expedition, 2005-2007 Ford Mustang, 2005-2007 Lincoln Navigator, and related Ford, Lincoln, and Mercury coil-on-plug applications. The Denso 673-6003 is also listed for 2008 Ford Explorer, 2008 Ford Explorer Sport Trac, 2008 Ford F-250 Super Duty, 2008 Ford F-350 Super Duty, 2008 Ford Mustang, 2008 Lincoln Mark LT, 2008 Lincoln Navigator, and 2008 Mercury Mountaineer.

Common Issues This Part May Address

• Engine misfire caused by a weak ignition coil
• Rough idle or hesitation during acceleration
• Hard starting related to ignition output loss
• Check engine light triggered by coil performance faults
• Intermittent spark delivery in coil-on-plug systems

Installation Notes and Tips

Verify the vehicle year, make, model, and engine-specific coil-on-plug application before ordering. Inspect the spark plug, connector, and boot condition during replacement, and confirm the ignition system is free of oil or moisture contamination that can shorten coil life. Use the vehicle service procedure for proper removal and installation.

Quality Assurance

Denso applies controlled testing and inspection processes to this ignition coil to support consistent electrical performance and fitment accuracy. The 673-6003 is part of Denso’s Coil on Plug line, which is built around OE-style ignition coil technology for direct replacement applications.