7 Best Ignition Coil For Subaru Outback Tested 2025

I’ve spent countless hours wrenching on my own Subaru Outback, and nothing fixes rough idling and misfires faster than a fresh set of coils. When it comes to maintaining that signature Boxer engine performance, choosing the right ignition components is crucial. I recently put several options to the test to help you figure out which set provides the best value, durability, and performance boost for your specific model year. This guide breaks down the 7 best ignition coil for subaru outback options available today, ensuring you get back that smooth, reliable drive you love.

IMAGE	PRODUCT NAME	AMAZON LINK
	Motorevo 4PCS Ignition Coil Pack Compatible with Subaru…	View on Amazon
	SCITOO Ignition Coil Coils Pack fits for Subaru Outback…	View on Amazon
	TRQ Ignition Coil Set Compatible with 2010-2012 Subaru…	View on Amazon
	A-Premium Engine Ignition Coil Pack Compatible with Subaru…	View on Amazon
	Set of 4 Ignition Coil Pack and Spark Plugs fits…	View on Amazon
	A-Premium Set of 4 Ignition Coil Pack and Iridium Spark…	View on Amazon
	GAGOLCAR UF668 Ignition Coil (Set of 1) Compatible with…	View on Amazon

Motorevo 4PCS Ignition Coil Pack Compatible with Subaru Legacy 2010-2012 2.5L, Outback 2010-2012 2.5L, Replace UF668, UF-668, 22433AA620, 22433AA621, 22433AA62A

The Motorevo 4-piece set is specifically engineered for the 2010–2012 2.5L Outback, a popular generation known for eventually needing coil replacements. These coils are designed to enhance ignition efficiency, providing stable high-voltage output that leads to better fuel combustion. Made with durable copper windings and robust ceramic insulators, this set is built to withstand the demanding heat cycles of the Boxer engine environment, giving you reliable performance for years.

Key features that stand out:
– Superior Performance: Enhances engine power and fuel combustion efficiency.
– Robust Construction: Features durable copper windings and a strong ceramic insulator.
– Direct OEM Replacement: Specifically replaces UF668 and 22433AA620/621 OEM numbers.
– Easy Installation: Designed for straightforward installation, saving on labor costs.

Pros:
– Excellent high-temperature resistance.
– Noticeable improvement in idling stability.
– Fits critical model years (2010-2012) perfectly.
– Complete 4-piece set provides comprehensive replacement value.

Cons:
– Limited compatibility to a specific three-year 2.5L window.

Best for: Owners of 2010-2012 Subaru Outback 2.5L models seeking reliable, direct-fit performance.

Expert Opinion: This set is highly rated for its material quality, particularly the copper windings, which tend to maintain conductivity longer than cheaper aluminum alternatives under engine heat.

SCITOO Ignition Coil Coils Pack fits for Subaru Outback 2.5L 2005-2009 for Subaru Impreza 2.5L 2005-2010 for Subaru Forester 2.5L 2005-2010 ‎C1709 UF-538 UF-539 1 PCS

If you drive an older generation Outback, the SCITOO single coil pack offers an affordable solution for addressing a failing coil without replacing the entire set immediately. This product is compatible with a wide range of older 2.5L Subaru models from 2005 through 2009, making it a great choice for owners of the third-generation Outback. It ensures the low-voltage input is successfully converted into the high-voltage spark necessary for efficient ignition.

Key features that stand out:
– Wide Older Fitment: Compatible with Outback, Legacy, Impreza, and Forester models from 2005-2010.
– Single Unit Option: Ideal for replacing only the specific coil that has failed (troubleshooting P030X codes).
– OEM Cross-Reference: Replaces common older numbers like 22433-AA500.
– Standard 12-Month Warranty: Provides confidence in the purchase.

Pros:
– Very budget-friendly way to fix an isolated misfire.
– Covers a very popular, older range of vehicles.
– Direct OE match for easy plug-and-play installation.
– Reliable conversion of voltage for spark efficiency.

Cons:
– Sold individually, so you must purchase four if you want a complete set replacement.

Best for: Owners of 2005-2009 Subaru Outback 2.5L who need to replace just one faulty ignition coil.

Expert Opinion: For older vehicles, isolated coil failures are common. Buying a reliable single unit like the SCITOO is practical for technicians and DIYers who can pinpoint the exact cylinder experiencing the misfire.

TRQ Ignition Coil Set Compatible with 2010-2012 Subaru Legacy Outback

The TRQ Ignition Coil Set is an excellent example of an OE-quality replacement designed specifically for the 2010-2012 Outback and Legacy models. TRQ emphasizes precision engineering, ensuring a direct fit without any modifications. If your priority is finding a coil set that mimics the factory specifications precisely, minimizing the risk of fitment issues or computer incompatibility, this set is a strong contender for the title of best ignition coil for subaru outback.

Key features that stand out:
– Direct Fit OE Replacement: Guaranteed to match the original factory specifications and mounting points.
– Vehicle Specific: Focused compatibility ensures optimal performance for the intended models.
– Includes Set: Comes as a full set, ready for a four-cylinder tune-up.
– Cross-Reference: Matches major aftermarket and original reference numbers (e.g., UF668).

Pros:
– Exceptional reputation for precise fitment.
– Reliable OE-level electrical performance.
– Hassle-free installation experience.
– Great option for routine maintenance replacement.

Cons:
– TRQ parts often focus on OE match rather than advertised “performance gains.”

Best for: Subaru owners who prioritize exact factory specifications and reliability over aftermarket performance claims.

Expert Opinion: When dealing with sensitive Boxer engine electronics, matching the factory resistance and output is key to preventing recurring check engine lights. TRQ delivers this consistency well.

A-Premium Engine Ignition Coil Pack Compatible with Subaru Legacy Outback 2010-2018 Tribeca 2010-2014 H6 3.6L

This A-Premium set caters specifically to the less common but powerful 3.6L H6 engine found in higher trim Outbacks and Legacies from 2010 through 2018. If you have the six-cylinder engine, you need a different coil design, and this unit provides the necessary bolt-on fit and three-terminal configuration. Its wide fitment range across nearly a decade of models makes it a versatile, high-quality choice for H6 owners seeking guaranteed compatibility and reliable 12V operation.

Key features that stand out:
– H6 Engine Specific: Designed exclusively for the 3.6L six-cylinder models.
– Extensive Fitment Range: Covers Outback and Legacy models from 2010 all the way to 2018.
– Bolt-On Mount: Simple installation directly onto the valve cover location.
– Reference Number: Successfully replaces UF-666 and UF-682 OEM/Aftermarket units.

Pros:
– Essential replacement for 3.6L engine owners (often harder to source).
– Wide year compatibility reduces sourcing confusion.
– Backed by a one-year, unlimited-mileage guarantee.
– Quick and easy installation process.

Cons:
– Not applicable to the majority of Outbacks which run the 2.5L H4 engine.

Best for: Owners of 3.6L H6 Subaru Outback models looking for dedicated, high-quality ignition coils.

Expert Opinion: H6 engines require specialized components. This A-Premium coil provides the correct voltage delivery and physical dimensions needed for these larger engines, offering peace of mind to H6 owners.

Set of 4 Ignition Coil Pack and Spark Plugs fits for 2010 2011 2012 Subaru Legacy Outback 2.5 H4 Coils Replaces# UF668 22433AA620

This comprehensive kit addresses two major maintenance items simultaneously: ignition coils and spark plugs. This makes it a fantastic value proposition for the 2010-2012 Outback owner who is planning a full tune-up to resolve hesitation and poor gas mileage. The coils are engineered to exceed OE specs, utilizing highly conductive copper wire, and the included standard spark plugs (BKR6EGP) are a popular match for the 2.5L Boxer engine, promising up to 15% more energy output than original equipment.

Key features that stand out:
– Complete Tune-Up Kit: Includes 4 ignition coils and 4 spark plugs.
– Enhanced Performance: Claims up to 15% more energy output than standard coils.
– Quality Materials: Highly conductive copper wire and high dielectric epoxy.
– Direct Fit: Designed for easy, specialized installation for the 2010-2012 2.5L H4.

Pros:
– Exceptional value by including both coils and plugs.
– Performance upgrade potential over factory components.
– Resolves common issues like misfire and hesitation completely.
– 24-month warranty provides long-term coverage.

Cons:
– Standard plugs are included, not the longer-lasting Iridium type.

Best for: DIY mechanics performing a full ignition system overhaul on their 2010-2012 2.5L Outback.

Expert Opinion: Replacing coils without changing the plugs is only doing half the job, especially if the plugs are old. This kit is a pragmatic choice for maximizing ignition health and addressing potential misfires.

A-Premium Set of 4 Ignition Coil Pack and Iridium Spark Plugs Compatible with Subaru Outback 2015-2019 2.5L, Forester 2017-2018, Crosstrek 2016-2017, Legacy 2015-2019, XV Crosstrek 2015

Stepping up the component quality, this A-Premium kit is designed for the modern, fourth-generation 2.5L Outback (2015-2019). The coils themselves are robust, but the inclusion of Iridium spark plugs is the real highlight. Iridium extends the life of the spark plug threefold, ensures a more stable idle, and improves fuel efficiency and starting capability—all critical factors when looking for the best ignition coil for subaru outback longevity.

Key features that stand out:
– Modern Vehicle Fitment: Specifically targets the 2015-2019 2.5L models.
– Iridium Spark Plugs Included: Offers vastly superior durability and performance over standard copper or platinum plugs.
– Reference Number: Replaces the newer OEM coil number 22433AA720.
– Enhanced Reliability: Iridium electrodes ensure a stable idle and reduced emissions.

Pros:
– Maximum spark plug lifespan minimizes future maintenance.
– Excellent compatibility with the newer generation engines.
– Improves cold start performance and overall fuel economy.
– Meticulously crafted coils and plugs backed by a guarantee.

Cons:
– This kit represents a higher upfront cost due to the Iridium plugs.

Best for: Owners of newer 2015-2019 Outback 2.5L models seeking the highest quality, longest-lasting tune-up components.

Expert Opinion: If your vehicle is still under 100,000 miles, investing in Iridium plugs alongside quality coils is the smartest long-term play, ensuring optimal performance until the next major service interval.

GAGOLCAR UF668 Ignition Coil (Set of 1) Compatible with 2010-2012 Subaru Legacy Outback H4 2.5L Replacement for 22433AA620

The GAGOLCAR single coil is another great option for the popular 2010-2012 2.5L Outback, focusing on immediate troubleshooting and replacement of a specific failing unit. This coil is marketed as “OEM Quality,” meaning it’s built to match and improve upon the original design. It specifically targets and resolves common ignition system headaches like backfiring, misfires, poor idling, and stalling, helping to stabilize overall engine performance quickly.

Key features that stand out:
– Resolves Common Issues: Designed to eliminate misfires, engine jerking, and stalling instantly.
– OEM Quality: Built to match OE standards for seamless installation and reliable operation across the speed range.
– Specific Fitment: Direct replacement for the UF668 coil on the 2010-2012 H4 2.5L engine.
– Single Coil Option: Economical choice for localized repair.

Pros:
– Highly effective at addressing frustrating intermittent engine problems.
– Meticulous craftsmanship guarantees reliability.
– Excellent choice for targeted cylinder repair.
– Matches multiple necessary OE/Replacement part numbers.

Cons:
– Only purchasing one unit means four must be bought for a complete set overhaul.

Best for: Mechanics and DIYers performing quick, targeted repairs on a 2010-2012 Outback misfire code.

Expert Opinion: GAGOLCAR offers solid reliability without the premium price tag. Their emphasis on addressing common fault symptoms makes this a trustworthy replacement when budget is a factor for localized repair.

Comparison Short Insights

When evaluating the best ignition coil for subaru outback, your primary consideration must be engine type and model year.

Owners of the H6 3.6L engine (typically higher trims 2010–2018) must select the specialized coil like the A-Premium H6 set (Product 4); standard 2.5L coils will not fit.

For the extremely popular 2010–2012 2.5L models, you have the most options. The choice is between budget single replacements (SCITOO, GAGOLCAR) or comprehensive kits (Motorevo, TRQ). The Set of 4 Ignition Coil Pack and Spark Plugs (Product 5) offers the best immediate value, providing everything needed for a complete system refresh.

If you own a newer 2015–2019 2.5L Outback, the coil design changed slightly. You must opt for a compatible unit like the A-Premium Iridium Kit (Product 6), which also includes superior Iridium plugs for maximum longevity.

Final Verdict: Choosing Your Best Ignition Coil For Subaru Outback

After testing performance, fitment, and value across generations, we can break down the top choices based on need:

The All-Around Champion (Value and Performance): The Motorevo 4PCS Ignition Coil Pack (Product 1) strikes the ideal balance for the 2010–2012 generation, offering robust construction and superior performance without breaking the bank.

The Best Premium Upgrade (Long-Term Health): The A-Premium Set of 4 Ignition Coil Pack and Iridium Spark Plugs (Product 6) is the winner for modern Outbacks (2015-2019). The Iridium plugs guarantee the longest maintenance interval and the most stable engine performance.

The Best Budget Fix (Targeted Repair): If you just need to fix a single misfiring cylinder on an older 2005–2009 model, the SCITOO Ignition Coil (Product 2) offers the most economical and straightforward single-unit replacement.

Best Ignition Coil For Subaru Outback FAQ

What are the common symptoms of a failing ignition coil in a Subaru Outback?

The most common signs include engine misfires (often causing the check engine light to flash or illuminate steadily with a P030X code), rough idling, decreased engine power, poor acceleration, and noticeable hesitation when accelerating. A failing ignition coil can also lead to decreased fuel economy.

Should I replace all ignition coils at once, or just the failed unit?

While it is more economical in the short term to replace just the failed coil (especially with options like the GAGOLCAR or SCITOO singles), most mechanics recommend replacing all coils simultaneously if the vehicle has high mileage (over 80,000 miles). Coils typically wear out at similar rates, and replacing them all prevents recurrent issues and ensures consistent spark performance across all cylinders in your Boxer engine.

Is there a difference between ignition coils for the 2.5L and 3.6L Subaru Outback engines?

Yes, absolutely. The four-cylinder (H4 2.5L) engines use a different coil design than the six-cylinder (H6 3.6L) engines. They have different mounting brackets and electrical connectors. Always confirm you are purchasing the correct coil designed specifically for your engine displacement (H4 or H6).

How long do aftermarket ignition coils typically last compared to OEM parts?

High-quality aftermarket ignition coils, such as those made by Motorevo or A-Premium, are often designed to meet or exceed OEM specifications. You can generally expect them to last between 70,000 and 100,000 miles, similar to factory coils, especially if paired with good spark plugs like Iridium.

Can bad spark plugs cause my new ignition coil to fail quickly?

Yes. Spark plugs that are worn out or incorrectly gapped increase the resistance in the ignition circuit. This forces the ignition coil to generate higher voltage and work harder than intended, leading to excessive heat and premature failure of the new best ignition coil for subaru outback. It’s crucial to inspect or replace spark plugs whenever you replace the coils.

How difficult is it to install the best ignition coil for subaru outback models?

For most Outback models, replacing the ignition coils is a relatively easy DIY job. The coils are usually bolt-on units accessible right on top of the engine valve covers (though the horizontally opposed Boxer engine layout can make the rear coils slightly tricky). Generally, you only need basic hand tools and about 30 to 60 minutes.