ENA UF553 Ignition Coil Set for Ford 3.5L & 3.7L V6

What Vehicles Fit UF553 / DG520 Ignition Coils?

Based on the supplied manufacturer application data, these are the primary applications.

Critical Fitment Warning

UF553/DG520 = naturally aspirated engine + large 2-pin connector.

Do NOT use these coils for:

• 3.5L EcoBoost/turbo engines
• Applications requiring a 3-pin coil
• Vehicles with the smaller electrical connector
• Vehicles where the original coil/interchange number doesn’t match

This is especially important with models such as the F-150, Explorer, Flex, Taurus and Lincoln MKS/MKT, where naturally aspirated and EcoBoost engines can appear within overlapping model years.

UF553 vs. UF646: Don’t Mix Them Up

This distinction is worth making prominent on the Pro Street product page.

The UF553/DG520 set is for compatible naturally aspirated 3.5L/3.7L V6 engines with the large 2-pin connector.

The UF646/DG549 coil set we covered previously targets compatible 3.5L EcoBoost applications.

So:

3.5L naturally aspirated → potentially UF553
3.5L EcoBoost → NOT UF553

Don’t buy by displacement alone.

Ford apparently felt that “3.5L V6” wasn’t sufficiently complicated without giving customers several completely different ignition configurations.

Signs Your UF553 Ignition Coils May Be Failing

A weak or failing ignition coil can cause:

• Rough idle
• Engine shaking
• Hesitation
• Misfires
• Poor acceleration
• Reduced power
• Hard starting
• Poor fuel economy
• Check Engine light
• Flashing Check Engine light

Pro Street’s live guide to 7 Bad Ignition Coil Symptoms You Should Never Ignore explains how failing coils produce these symptoms and how to diagnose them before replacing parts.

P0300 and Ford V6 Misfires

A failing ignition coil can contribute to P0300 – Random/Multiple Cylinder Misfire, but the code doesn’t automatically mean all six coils need replacement.

Possible causes include ignition coils, worn spark plugs, injector problems, vacuum leaks, fuel-delivery issues, wiring faults and mechanical problems.

Use Pro Street’s live P0300 Random/Multiple Cylinder Misfire Guide to narrow down the actual cause before loading the parts cannon.

Cylinder-specific misfires can also generate P0301 through P0306.

If you have P0304, for example, cylinder four is misfiring. That doesn’t necessarily mean coil four is bad.

Test the Coil Before Replacing It

On an accessible coil-on-plug application, a coil-swap test can provide useful evidence.

If cylinder three is misfiring, record the codes and freeze-frame information, move the cylinder-three coil to another cylinder, install a known-good coil in its place, run the engine and rescan it.

If the misfire follows the suspect coil, the coil becomes a strong suspect.

If the misfire remains on cylinder three, continue diagnosing the spark plug, injector, wiring, compression and other potential causes.

Replacing six coils because one cylinder misfires isn’t diagnosis.

It’s retail therapy for automobiles.

Check the Spark Plugs at the Same Time

Worn spark plugs increase the voltage demand placed on ignition coils.

If you’re refreshing six aging coils, inspect the plugs for excessive electrode wear, enlarged gap, cracked porcelain, carbon buildup, oil contamination and other signs of deterioration.

Pro Street’s live How to Pick Spark Plugs for Your Build guide covers plug fitment, material, heat range and gap.

Should You Replace All Six Coils?

Because this package contains six coils, it’s particularly convenient for a complete V6 ignition refresh.

Replacing all six can make sense when the vehicle has high mileage, multiple original coils have failed, the coils show similar age-related deterioration or you’re already performing a larger ignition-system service.

If one relatively new coil has conclusively failed and the other five are healthy, replacing all six isn’t automatically necessary.

The advantage of this kit is that you have a matched six-piece set when a complete replacement is warranted.

Popular Ford 3.7L Mustang Application

The 2011–2016 Ford Mustang 3.7L V6 is a particularly interesting application for the UF553 set.

These naturally aspirated Cyclone V6 Mustangs offered substantially more performance than older base-model Mustangs, making ignition condition relevant for both daily driving and enthusiast use.

If a 3.7 Mustang begins breaking up under acceleration, ignition coils and plugs belong on the diagnostic checklist—but they’re not the only possible causes.

F-150 3.7L and 3.5L Applications

For the F-150, pay close attention to the year and engine:

2011–2014 F-150 – 3.7L naturally aspirated V6
2015–2016 F-150 – compatible 3.5L naturally aspirated V6

Do not confuse these applications with the 3.5L EcoBoost F-150.

That’s precisely why Pro Street should show the engine and connector warning directly beside the Add to Cart button rather than burying it somewhere customers discover approximately eight minutes after opening the box.

Is the ENA UF553 Coil Pack Set Worth It?

For a compatible naturally aspirated Ford-family 3.5L or 3.7L V6, the ENA UF553 / DG520 six-piece ignition coil set provides a convenient complete replacement package.

Its application range covers some extremely common vehicles, including the Ford F-150, Mustang, Explorer, Edge, Taurus and Flex, along with Lincoln MKX/MKZ/MKS/MKT, Mazda CX-9 and Mazda6 applications.

The most important buying rule is simple:

Verify the engine AND connector.

If the vehicle is turbocharged/EcoBoost or has the wrong connector, this isn’t the correct coil.

Shop replacement ignition and performance parts through Pro Street Online.