A Guide to Spark Plugs for the 2014-2020 Ford Fusion
Fix misfires and restore your Fusion's performance by choosing the right spark plugs for your engine.
- Always use high-quality Iridium spark plugs from brands like NGK, Denso, or Motorcraft for the best performance and longevity, especially in EcoBoost engines.
- If you own a 1.5L EcoBoost model, be aware that misfire symptoms could also be caused by a known coolant leak issue (TSB 20-2100).
- Always check and adjust the spark plug gap before installation, even if the plugs are advertised as "pre-gapped".
- Do not use anti-seize compound on modern Motorcraft or NGK plugs; their special coating prevents seizing and adding lubricant can lead to over-torquing.
Is Your Fusion Telling You It's Time for New Spark Plugs?
When spark plugs wear out, your car will usually let you know. The signs can start small but will get worse over time. Ignoring them can lead to more expensive repairs, like a damaged catalytic converter, down the road.
- Rough Idle: Your car may shake or sputter when you're stopped at a light.
- Engine Misfires: You might feel a jerking or hesitation as you accelerate. The engine will sound like it's coughing or stumbling.
- Poor Acceleration: The car feels sluggish and doesn't have the power it used to.
- Worse Gas Mileage: You'll find yourself filling up the tank more often because worn plugs waste fuel.
- Check Engine Light: A failing spark plug is a common reason for the check engine light to come on. If the light is flashing, it signals a severe misfire that needs immediate attention.
Special Note for 1.5L EcoBoost Owners
Some 2014-2019 Fusions with the 1.5L EcoBoost engine are known to have an issue where coolant can leak into the cylinders (Ford TSB 20-2100). The symptoms are nearly identical to spark plug failure, including misfires and a rough idle. A key sign of this problem is a spark plug that looks unusually dark, burnt, or wet when removed. If you have a 1.5L engine and suspect this issue, it's important to have it properly diagnosed by a mechanic, as simply replacing the spark plug will not fix the underlying coolant leak.
Choosing the Right Aftermarket Spark Plugs
Your Fusion came from the factory with high-quality iridium spark plugs, and it's best to stick with that type. Cheaper copper plugs are not designed for the demands of modern engines, especially the turbocharged EcoBoost models. When shopping for aftermarket plugs, here’s how the brands generally stack up.
- Top Tier (OEM Quality): Brands like NGK and Denso are often the original equipment manufacturers for Ford. Choosing their iridium or ruthenium options is the safest bet for factory-level performance and longevity. Many owners and mechanics consider them the best choice.
- Quality Aftermarket: Bosch, Champion, and Autolite offer excellent iridium and platinum spark plugs that are a reliable alternative to OEM. They provide good performance and durability for the price.
- Standard/Value: Brands like Accel and ACDelco are also available. While functional, they are less commonly used for modern Ford applications. Ensure you are getting the correct iridium or platinum plug specific to your Fusion's engine.
| Plug Type | Price Range (Per Plug) | Best For |
|---|---|---|
| New Aftermarket (Iridium/Ruthenium) | $10 - $22 | All engines, especially EcoBoost models. Best performance and longest life. |
| New Aftermarket (Platinum) | $6 - $15 | Good performance for 2.5L engines, 🎬 See how to replace spark plugs on 2006-2012 2.5L engines. but iridium is still preferred. |
| New OEM (Motorcraft) | $12 - $22 | Guaranteed factory fit and performance. |
Pro Installation Tips
Replacing spark plugs is a manageable DIY job for many owners. 🎬 Watch this step-by-step guide for 2013-2020 2.0L Fusion models. Here are a few tips:
- Check the Gap: Even if plugs come "pre-gapped," always verify the gap with a feeler gauge before installation. Your owner's manual will list the correct specification for your engine.
- No Anti-Seize Needed: Modern NGK and Motorcraft plugs have a special plating that prevents seizing. Do not add anti-seize compound, as it can cause you to overtighten the plug and damage the engine's cylinder head.
- Use a Torque Wrench: Overtightening can damage your engine. Always tighten plugs to the manufacturer's specified torque.
- Clean the Wells: Before removing the old plugs, use compressed air to blow any dirt out of the spark plug wells to prevent it from falling into your engine.
Frequently Asked Questions
How often should I replace the spark plugs on my Ford Fusion?
The factory recommendation for the original iridium spark plugs is typically 100,000 miles. However, many mechanics and owners, especially those with turbocharged EcoBoost engines, recommend replacing them every 60,000 to 80,000 miles as preventative maintenance to keep the engine running at its best.
What's the difference between a bad spark plug and a bad ignition coil?
The symptoms are nearly identical—rough idle, misfiring, and a check engine light. A bad spark plug fails to create a good spark, while a bad ignition coil fails to send the high voltage needed to make a spark. If a misfire code (like P0302 for cylinder 2) persists after changing the spark plug, the next step is often to swap the ignition coil from the misfiring cylinder with one from a working cylinder. If the code follows the coil (e.g., it changes to P0303 after moving the coil to cylinder 3), the coil is bad and needs to be replaced.
Should I replace all spark plugs at once?
Yes. Spark plugs wear out at a similar rate. If one has failed, the others are likely not far behind. Replacing them all at the same time ensures balanced engine performance and saves you from having to do the same job again in a few months.
What does spark plug "gapping" mean?
The "gap" is the small space between the center and ground electrodes at the tip of the spark plug. The spark has to jump this gap. The distance is critical and must be set to the exact specification for your Fusion's engine to ensure a strong, efficient spark. An incorrect gap can cause misfires and poor performance.
Helpful Videos
Technical Specifications
OEM Part Numbers: HYFS-094-YECX CYFS-12Y-PCTX AYFS-32Y-RX SP530X SP550X
Spark plug type, gap, and torque specifications vary by engine (1.5L EcoBoost, 2.0L EcoBoost, 2.5L). The factory-installed plugs are Iridium. Always confirm the correct part number and gap size for your specific engine using your VIN or owner's manual. Common spark plug sockets needed are 16mm (5/8") or 14mm, and the ignition coil bolts are typically 8mm.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Ford Fusion: