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Ford Spark Plugs

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Why Spark Plugs Are Critical for Engine Ignition

A spark plug provides the essential spark needed to ignite the air-fuel mixture inside the engine’s cylinders. This small but powerful part ensures smooth starts, efficient combustion, and reliable acceleration. Worn or fouled plugs can lead to misfires, poor fuel economy, and reduced power output.

Replacing Spark Plugs in Your Ford

For a performance car like the Ford Mustang, high-quality spark plugs are vital to maintain factory-level horsepower and torque. OEM plugs are engineered for precise heat range, electrode design, and durability, making them ideal for both everyday driving and spirited performance.

Common Types of Spark Plugs

  • Copper spark plugs for cost-effective performance.
  • Platinum plugs for longer service intervals.
  • Double platinum plugs for high durability.
  • Iridium spark plugs for maximum efficiency.
  • Performance spark plugs for increased ignition power.
  • OEM-specific spark plugs for exact fitment.
  • Specialty plugs for turbocharged applications.

Best Practices in Maintaining Your Ignition System

  1. Inspect spark plugs every 30,000 miles.
  2. Check for fouling or electrode wear.
  3. Replace as recommended in the service manual.
  4. Use OEM plugs for accurate ignition timing.
  5. Pair replacements with a clean ignition system.

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Spark Plug

Part Number: CYFS-12-YPX
Ford Ford
Other Names: sp522x
Replaces: CYFS-12-YP, SP-522
Fits:
  • Ford:
    • Focus
MSRP $18.36
$11.01

Spark Plug

Part Number: CYFS-12Y-RT3
Ford Ford
Other Names: sp594
Replaces: CYFS-092-YPT, CYFS-12Y-PT, CYFS-92-YPT, SP-542, SP-578
Description: 2.3L. 2.0L, 2019-24. 3.5L, to 7/19/21. 2.7L, 2015-17. 2.7L, 2018-20. 2.0L, 2020-22. 2.7, 3.0L. 2017-20.
Fits:
  • Ford:
    • Bronco,
    • Edge,
    • Escape,
    • Expedition,
    • Explorer,
    • F-150,
    • Fusion,
    • GT,
    • Maverick,
    • Police Interceptor Utility,
    • Ranger
  • Lincoln:
    • Aviator,
    • Continental,
    • Corsair,
    • MKX,
    • MKZ,
    • Nautilus,
    • Navigator
MSRP $18.18
$10.90

Spark Plug

Part Number: AWSF-44C-AX
Ford Ford
Other Names: sp409ax
Replaces: AWSF-44C, AWSF-44C-A, AWSF-44C-F4, AWSF-44C-F6, SP-409, SP-409-A
Description: Vendor:motorcraft. Vendor #awsf 44-c. Calif.
Fits:
  • Ford:
    • Aerostar,
    • Country Squire,
    • LTD,
    • LTD Crown Victoria,
    • Mustang,
    • Ranger,
    • Taurus,
    • Thunderbird
  • Lincoln:
    • Continental,
    • Mark VII,
    • Town Car
  • Mercury:
    • Capri,
    • Colony Park,
    • Cougar,
    • Grand Marquis,
    • Marquis,
    • Sable
MSRP $4.63
$3.31

Spark Plug

Part Number: AWSF-54C
Ford Ford
Other Names: sp429
Replaces: AWSF-54C-F6
Fits:
  • Ford:
    • LTD,
    • Mustang,
    • Thunderbird
  • Mercury:
    • Capri,
    • Cougar,
    • Marquis
MSRP $7.05
$4.62

Spark Plug

Part Number: AZFS-32F-EX
Ford Ford
Other Names: sp478x
Replaces: AZFS-32F-E, AZFS-32F-EF4, SP-478
Description: 2.0L.
Fits:
  • Ford:
    • Contour,
    • Escape,
    • Escort,
    • Focus
  • Mercury:
    • Cougar,
    • Mystique
MSRP $12.45
$7.47

Spark Plug

Part Number: AGSF-34C-X
Ford Ford
Other Names: sp444x
Replaces: AGSF-34C, AGSF-34C-A, AGSF-34C-F4, AWSF-34C, AWSF-34C-F4, SP-444, SP-444-A
Description: Vendor:motorcraft. Vendor #awsf 34-c.
Fits:
  • Ford:
    • Escort,
    • EXP
  • Mercury:
    • Lynx,
    • Tracer
MSRP $6.33
$4.14

Spark Plug

Part Number: AGSF-34F-MX
Ford Ford
Other Names: sp504x
Replaces: AGSF-34E-E, AGSF-34E-EF4, AGSF-34E-EF6, AGSF-34E-EM, AGSF-34E-EMF6, AGSF-34F-M, AGSF-34F-MF4, AGSF-34F-MF6, AGSF-34P-P, AGSF-34P-PF4, AWSF-34P-P, AWSF-34PP-F6, SP-504
Description: 4.2L. 2.0L sohc.
Fits:
  • Ford:
    • E-150,
    • E-150 Club Wagon,
    • E-150 Econoline,
    • E-150 Econoline Club Wagon,
    • E-250,
    • E-250 Econoline,
    • Escort,
    • F-150,
    • F-150 Heritage,
    • Focus,
    • Thunderbird
  • Mercury:
    • Cougar,
    • Tracer
MSRP $8.20
$5.37

Spark Plug

Part Number: AGSF-42F-MX
Ford Ford
Other Names: sp486x
Replaces: AGSF-42E-EM, AGSF-42E-EMF6, AGSF-42F-M, AGSF-42F-MF6, AWSF-42E-E, AWSF-42E-EF6, AWSF-42P, AWSF-42P-F6, AWSF-42P-P, AWSF-42P-PF6, SP-486
Description: Optional. Vendor:motorcraft. Vendor #awsf 42-pp. 3.8L. 4.2L. Vendor #agsf 42-eem.
Fits:
  • Ford:
    • Aerostar,
    • E-150 Econoline,
    • E-150 Econoline Club Wagon,
    • E-250 Econoline,
    • Explorer,
    • F-150,
    • Freestar,
    • Mustang,
    • Ranger,
    • Windstar
  • Mercury:
    • Monterey
MSRP $8.58
$5.62

Spark Plug

Part Number: AGSP-32F-PX
Ford Ford
Other Names: sp485x
Replaces: AGSP-32F-P, AGSP-32F-PF6, SP-485
Fits:
  • Mercury:
    • Villager
MSRP $12.84
$7.70

Spark Plug

Part Number: CYFS-092-YPT4X
Ford Ford
Other Names: sp581x
Replaces: CYFS-092-YPT4, CYFS-92-YPT4, CYFS-92-YPT4X, KR3Z-12405-A, SP-579, SP-581
Description: 5.2L, with supercharger.
Fits:
  • Ford:
    • F-150,
    • Mustang
MSRP $18.18
$10.90

Spark Plug

Part Number: CYFS-12-YECX
Ford Ford
Other Names: sp525x
Replaces: CYFS-12-YEC, SP-525
Description: 1.6L non turbo.
Fits:
  • Ford:
    • Fiesta
MSRP $18.18
$10.90

Spark Plug

Part Number: BSF-44P-X
Ford Ford
Other Names: sp452x
Replaces: BSF-44P, BSF-44P-F6, SP-452
Description: Vendor:motorcraft. Vendor #BSF 44-P.
Fits:
  • Ford:
    • E-250 Econoline,
    • E-350 Econoline,
    • E-350 Econoline Club Wagon,
    • F-150,
    • F-250
MSRP $7.89
$5.16

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