One year limited warranty for replacement only.

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Set of 8 Ignition Coils Brown boots DG521 and Motorcraft SP-509 Spark Plugs Compatible with Ford Expedition F-150 Super Duty F-250 F-350 F-450 F-550 F53 4.6L 5.4L C1659 DG521

Set of 8 Ignition Coils Brown boots DG521 and Motorcraft SP-509 Spark Plugs Compatible with Ford Expedition F-150 Super Duty F-250 F-350 F-450 F-550 F53 4.6L 5.4L C1659 DG521

Q: What size socket size do i need

These require a 7mm socket. be sure to get an extension or a deep well to have room to maneuver.

Q: Are they double platinum ?

Yes, for SP509 ,it is Double Platinum spark plug.

Q: Anyone know if these plugs have any issues? I know 5.4 motors were bad. if you had an easy experience replacing olugs or a bad experience please respo

They changed head design in mid 2008 So end of 2008 and newer they are fine and no worse than changing plugs on anything else. This is the updated design. Ford noted the new design by using brown coil boots. So you would have to pull one to find out if you have new or old style. Black boots is the 2 piece.

Product ID: 71226817

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Details

Brand
MAS
Vehicle Service Type
fd 509
Item Weight
4 Pounds
Connector Gender
Installation Type
Plug In

⚡High energy output

🔥High heat resistance

🔧Direct plug-in replacement

Frequently Bought Together

MAS Set of 8 Ignition Coils Brown boots DG521 and Motorcraft SP-509 Spark Plugs Compatible with Ford Expedition F-150 Super Duty F-250 F-350 F-450 F-550 F53 4.6L 5.4L C1659 DG521

Permatex 22058 Dielectric Tune-Up Grease, 3oz. - High Performance Dielectric Grease Used To Protect Terminals, Spark Plugs, Wiring And Other Electrical Connections Against Salt, Dirt, And Corrosion

LEXIVON 9/16-Inch Spark Plug Swivel Socket, 3/8" Drive x 6" Total Length | Enhanced Magnetic Design with Thin Wall Socket, Cr-v Steel (LX-SSPS9166)

Description

⚡ Ignite your Ford’s power with precision and durability!

EFFORTLESS INSTALLATION - Plug-and-play design means zero downtime—get back on the road faster with no mechanic needed.
COMPLETE IGNITION UPGRADE - Includes 8 MAS ignition coils with Motorcraft SP-509 spark plugs for optimized engine performance and reliability.
BUILT TO ENDURE EXTREME HEAT - Crafted with high-heat resistant compounds to withstand engine stress and keep your ride firing strong.
CONFIDENCE BACKED BY WARRANTY - One-year limited warranty ensures peace of mind with every mile you conquer.
PRECISION FIT FOR FORD POWERHOUSES - Specifically engineered for 2008-2014 Ford Expedition, F-150, Super Duty & more—no guesswork, just perfect compatibility.

This MAS set includes 8 brown boot ignition coils (DG521) paired with Motorcraft SP-509 spark plugs, designed as direct replacements for select 2008-2014 Ford models including Expedition, F-150, and Super Duty trucks. Engineered for high heat resistance and high energy output, these coils ensure reliable ignition performance. Easy plug-in installation and a one-year limited warranty make this kit a smart upgrade for Ford owners seeking durability and peak engine efficiency.

Specifications

Brand	MAS
Vehicle Service Type	fd 509
Item Weight	4 Pounds
Connector Gender	Female-to-Male
Installation Type	Plug In
Manufacturer	King Auto Parts
UPC	716253448499
Automotive Fit Type	Vehicle Specific Fit
OEM Part Number	C1659, DG 521, FD-509, 5C1716, 8L3Z12029A / 8L3Z-12029-A, C1659, GN10233, 5C1716, E509, 52-2071, IC697, 8L3Z-12029-A, HJFS-24FP, SP-509, SP509
Item Weight	4 pounds
Package Dimensions	11.22 x 9.84 x 3.66 inches
Is Discontinued By Manufacturer	No
Manufacturer Part Number	DG521SP509

Have a Question? See What Others Asked

Is there a warranty?

What size socket size do i need

Are they double platinum ?

Anyone know if these plugs have any issues? I know 5.4 motors were bad. if you had an easy experience replacing olugs or a bad experience please respo

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