Motorcraft SP446A Copper Spark Plug AGSF42C6A OE Replacement

The Motorcraft SP446A (manufacturer part number AGSF42C6A) is a copper core spark plug engineered to original equipment specifications for select Ford, Lincoln, and Mercury applications. As a genuine Motorcraft component, it delivers the same fit, form, and function as the plug installed at the factory — with no modifications or adjustments required.

Key Features:

• Copper core center electrode for reliable ignition performance and efficient heat transfer
• Factory pre-set gap — ready to install straight out of the box
• Engineered to meet strict Ford Motor Company specifications for ignition reliability
• Multi-rib insulator design helps protect against misfire
• Helps eliminate misfires, reduce fuel consumption, and optimize emissions
• Helps prevent false check engine lights when used as directed
• Backed by Motorcraft's Service Parts Warranty

Cross-reference: Motorcraft AGSF42C6A | SP446A. Sold individually. Always verify fitment using your vehicle's VECI label or owner's manual for correct plug gap specification.