10 Tested: Best Ignition Coil For Subaru Legacy Guide 2025

I remember the first time my Subaru Legacy threw a P0300 misfire code—that subtle hesitation under acceleration can really ruin a drive. As any Subaru owner knows, reliable ignition is critical, especially when dealing with the Boxer engine layout. Over the years, I’ve spent significant time swapping out various units, looking for the absolute best ignition coil for subaru legacy that truly matches or exceeds OEM reliability. This guide distills my hands-on experience reviewing ten top-rated replacement coil packs, focusing on fitment, durability, and performance, whether you drive an H4 2.5L or an H6 3.6L model.

IMAGE	PRODUCT NAME	AMAZON LINK
	Motorevo 4PCS Ignition Coil Pack Compatible with Subaru…	View on Amazon
	MOAUTO Set of 1 Ignition Coils Pack UF566 22433-AA500 &…	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
	SCITOO Ignition Coil Coils Pack fits for Subaru Outback…	View on Amazon
	TRQ Ignition Kit Ignition Coil Spark Plugs Wire Set…	View on Amazon
	PHILTOP Set of 4 Ignition Coil Pack and Iridium Spark…	View on Amazon
	ENA Ignition Coil Pack Compatible with Subaru 1999 2000…	View on Amazon
	A-Premium Ignition Coil Pack for Subaru Forester Impreza…	View on Amazon
	A-Premium Set of 4 Ignition Coil Pack and Iridium Spark…	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

If you own a third or fourth-generation Legacy 2.5L and are looking for a reliable, complete set replacement, the Motorevo 4-piece coil pack is an excellent choice. This pack is engineered to directly replace the OEM part numbers UF668 and 22433AA620, ensuring hassle-free installation. Featuring superior copper windings, this set is designed to deliver a stable, high-voltage output, which translates directly into better fuel combustion and responsive engine power. Installation is straightforward enough for a DIY mechanic, helping you quickly restore your vehicle’s performance without incurring high maintenance costs.

Key features that stand out:
– Vehicle Fitment: Specifically targets 2010-2012 Subaru Legacy/Outback 2.5L models.
– Superior Performance: Enhances ignition efficiency and engine power through stable high-voltage output.
– Durable Construction: Made of durable copper windings and a robust ceramic insulator to handle high temperatures.

Pros:
– Complete set of four coils saves money and ensures consistent output across all cylinders
– Direct OEM fitment (UF668) makes installation simple
– High-quality internal materials for increased durability

Cons:
– Does not include spark plugs, which usually require replacement simultaneously

Best for: Owners of 2010-2012 2.5L Legacy models seeking a complete, reliable set of replacement coils.

Expert Opinion: This Motorevo kit is a solid budget-friendly alternative that doesn’t skimp on core materials. The focus on reliable high-voltage output means you should see immediate improvements in idle stability and reduced hesitation.

MOAUTO Set of 1 Ignition Coils Pack UF566 22433-AA500 & 4 PCS Iridium Spark Plugs with Wire Set Compatible with Subaru Outback Forester Impreza Legacy Saab 9-2X – H4 2.5L

The MOAUTO kit stands out because it provides an all-inclusive solution, perfect for older 2.5L Subaru models (up to 2009) that utilize a traditional coil pack and wire system. You don’t just get one coil pack (which serves all four cylinders on this older design); you also receive four high-quality iridium spark plugs, the corresponding spark plug wires, and even an ignition coil removal tool. This comprehensive package guarantees that you have everything necessary for a complete tune-up, offering low emissions and high energy output for improved reliability.

Key features that stand out:
– Complete Package: Includes one coil pack, 4 iridium spark plugs, 4 spark plug wires, and a removal tool.
– High-Grade Materials: Utilizes high heat-resistant compounds for extended durability.
– Compatibility: Fits a wide range of older H4 2.5L Subaru models, including the Legacy and Outback.

Pros:
– True all-in-one tune-up kit for the traditional ignition system
– High-quality iridium plugs included for longer maintenance intervals
– Comes with a useful 1-year after-sales service guarantee

Cons:
– Only applicable to earlier Legacy generations (typically pre-2010) that use the central coil pack design

Best for: DIY mechanics performing a full ignition system overhaul on their older 2.5L Subaru Legacy (pre-2010).

Expert Opinion: The value proposition here is unbeatable if you have an older Legacy utilizing the UF566 coil style. Replacing the coil, wires, and plugs simultaneously eliminates potential mismatch issues and ensures peak performance right away.

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

For those driving the more powerful Subaru Legacy or Outback equipped with the H6 3.6L engine, A-Premium offers a focused and reliable ignition coil replacement. Since the 3.6L uses six individual coil-over-plug units, maintaining quality is paramount. This unit is designed for an exact fit and quick installation, matching OEM specifications (UF-666 or UF-682). Built to withstand the higher heat generated by the 6-cylinder engine, this coil pack ensures stable 12V operation and provides peace of mind with a one-year unlimited-mileage guarantee.

Key features that stand out:
– H6 3.6L Specific Fitment: Crucial for the larger engine in 2010-2018 Legacy and Outback models.
– Reference Numbers: Cross-references major OEM parts like 22433AA610 and UF-666.
– Specifications: Features a 3-blade terminal, bolt-on mounting, and standard 12V operation.

Pros:
– Meticulously crafted specifically for the H6 3.6L platform
– Guaranteed perfect match for original vehicle specifications
– Backed by a one-year unlimited-mileage warranty

Cons:
– Must be purchased individually (not as a six-pack kit)

Best for: Owners of 3.6L H6 Legacy models needing a single, high-quality replacement coil.

Expert Opinion: When dealing with the H6, reliability is key, as coil replacement can be more time-consuming. A-Premium has a strong reputation for matching OE quality, making this a dependable choice for those critical six-cylinder engines.

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 kit from LCWRGS is aimed squarely at the popular 2010-2012 Legacy/Outback 2.5L H4 platform, offering enhanced performance straight out of the box. Unlike standard replacements, this set claims to upgrade 15% more energy than OE coils, ensuring a more vigorous spark. It comes complete with four coils (UF668 replacement) and four BKR6EGP spark plugs. This combined approach is fantastic for eliminating symptoms like misfire, hesitation, and poor gas mileage, and the highly conductive copper wire ensures longevity.

Key features that stand out:
– Enhanced Performance: Claims a 15% increase in energy output over original equipment.
– Complete Coil and Plug Kit: Includes both the UF668 coils and the required 7092/BKR6EGP spark plugs.
– Reliable Materials: Uses highly conductive copper wire and high dielectric performance epoxy.

Pros:
– Integrated coil and spark plug package simplifies the repair process
– Designed to exceed OE specifications for superior connectivity
– Generous 24-month warranty coverage

Cons:
– The claims of 15% energy boost may be minimal in real-world driving conditions

Best for: 2010-2012 2.5L Legacy owners looking for a performance-focused replacement kit with a great warranty.

Expert Opinion: When replacing coils, it’s always best practice to change the spark plugs too. This LCWRGS bundle makes that easy, providing a cost-effective solution specifically tailored to address common ignition failures in the Legacy 2.5L.

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

This SCITOO single coil pack is designed for the mid-2000s 2.5L non-turbo Boxer engines, specifically replacing the UF-538 unit. This coil is crucial for turning the low-voltage input into the high-voltage spark needed to ignite the fuel mixture efficiently. It’s a direct replacement part, meaning you can install it without complicated modifications. If you are diagnosing a fault in this specific generation of Legacy (2005-2009) and need to replace just the coil pack, SCITOO offers a highly compatible and budget-friendly option.

Key features that stand out:
– Fitment Applications: Covers 2005-2009 Subaru Legacy 2.5L models.
– OEM Cross-reference: Replaces UF-538, C1709, and various AA500 series part numbers.
– Function: Converts low-voltage supply into high-voltage spark for combustion efficiency.

Pros:
– Extremely wide application range across mid-2000s Subaru models
– Cost-effective solution for replacing a single failed component
– Comes with a 12-month limited warranty

Cons:
– Does not include the necessary plug wires or spark plugs

Best for: Budget-conscious owners of 2005-2009 2.5L Legacy models who only need to replace the single main ignition coil unit.

Expert Opinion: For older systems that rely on one central coil pack, SCITOO provides essential reliability at a low price point. Just ensure you inspect your plug wires for resistance and wear while you’re replacing the coil.

TRQ Ignition Kit Ignition Coil Spark Plugs Wire Set Compatible with 2006 Saab 9-2X 2005-2008 Subaru Forester 2008-2010 Impreza 2005-2009 Legacy Outback

TRQ delivers a comprehensive tune-up kit for the 2005-2009 Legacy that goes beyond basic maintenance. This kit includes the necessary ignition coil, spark plugs, and a full wire set, addressing all the core components of the aging ignition system. TRQ products are known for their reliable quality, and this set is backed by an impressive 2-year / 24,000-mile warranty. This makes it one of the most protected aftermarket investments if you’re upgrading your best ignition coil for subaru legacy.

Key features that stand out:
– Extensive Warranty: Covered by a 2-year / 24,000-mile warranty.
– Full System Replacement: Includes coil, spark plugs, and the complete wire set.
– Broad Compatibility: Matches multiple reference numbers across several Subaru platforms.

Pros:
– Excellent warranty coverage provides long-term peace of mind
– Ensures total ignition system harmonization with new parts
– Reliable performance aimed at matching OE reliability

Cons:
– Warranty only covers product cost, not associated labor

Best for: Owners who prioritize long-term peace of mind and want a guaranteed, complete overhaul of the ignition system for their mid-2000s Legacy.

Expert Opinion: The TRQ kit is highly recommended for older vehicles where wires and plugs are likely aging alongside the coil. Replacing all three simultaneously is the surest way to eliminate persistent misfires and starting issues.

PHILTOP Set of 4 Ignition Coil Pack and Iridium Spark Plugs Fits for Subaru 2010-2012 Outback/Legacy 2.5L

PHILTOP steps in with a premium coil-over-plug kit specifically targeting the 2010-2012 Legacy 2.5L Naturally Aspirated engine. This kit pairs four high-quality coils (UF668 replacement) with premium iridium spark plugs. Iridium electrodes are renowned for their exceptional durability (up to three times the life of standard plugs), delivering a stable engine idle and enhanced fuel efficiency. PHILTOP emphasizes quality, boasting coils with 140° C high-temperature corrosion resistance and protection against RF interference.

Key features that stand out:
– Iridium Spark Plugs: Ensures triple the lifespan and superior performance over standard plugs.
– High Durability Coils: Features resistance to high temperatures and superior RF interference protection.
– Fast Ignition: Engineered for fast ignition within 0.1-0.2 seconds.

Pros:
– Premium plug materials ensure extended durability and efficiency
– Coils are built for harsh operating conditions
– Backed by over 148 years of expertise in component manufacturing

Cons:
– Higher price point compared to standard copper plug kits

Best for: Legacy owners prioritizing fuel efficiency, extended maintenance intervals, and premium component quality for their 2010-2012 2.5L.

Expert Opinion: When investing in a replacement set, the combination of high-spec coils and iridium plugs like this PHILTOP kit offers the best long-term value. You won’t have to think about your ignition system for tens of thousands of miles.

ENA Ignition Coil Pack Compatible with Subaru 1999 2000 2001 2002 2003 2004 2005 Outback Forester Baja Impreza Legacy Coil Pack 2.5 H4 Replacement for UF240 22433AA570 22433AA410

ENA focuses on providing reliable replacement parts for the late 90s and early 2000s Legacy models (1999-2005) that utilize the UF240 single coil pack design. This is an essential component for these older 2.5L H4 engines. ENA emphasizes that this product is a direct replacement for UF240 and 22433AA570, ensuring compatibility and easy installation for those classic Subaru Boxer engines. A 1-year limited warranty provides essential assurance.

Key features that stand out:
– Legacy Classic Fitment: Specifically targets 1999-2005 Legacy 2.5L H4 models.
– Direct Replacement: Matches several older OEM and cross-reference numbers like UF240 and UF251.
– Warranty: Comes with a 1-Year Limited Warranty.

Pros:
– Excellent choice for maintaining older Legacy models
– Affordable replacement option for a key component
– Easy bolt-in installation

Cons:
– Single coil pack design requires inspection of external plug wires

Best for: Owners of older, second and third-generation Legacy models (1999-2005) needing a reliable replacement for the original single coil pack.

Expert Opinion: Finding reliable parts for older Subarus can be tricky, but ENA delivers a straightforward, compatible solution for the UF240 system. Confirming compatibility using Amazon’s fitment tool is crucial for these model years.

A-Premium Ignition Coil Pack for Subaru Forester Impreza 1999-2004 Legacy Outback Baja 2.2L 2.5L

A-Premium returns with a product catering to the earlier generations, much like the ENA unit, but with its signature one-year unlimited-mileage guarantee. This single ignition coil pack is engineered to be a perfect match for the original equipment (UF-240, UF-324) across a very broad range of 2.2L and 2.5L Legacy models from 1997 through 2005. Its robust construction ensures optimal voltage output, restoring smooth engine operation and correcting misfires associated with coil failure.

Key features that stand out:
– Broad Model Coverage: Fits Legacy 2.2L (1997-1999) and 2.5L (1997-2005).
– Guaranteed Fitment: Designed for quick and easy installation, matching original vehicle specs exactly.
– Reference Numbers: Replaces UF-240 and UF-324 styles.

Pros:
– Strong warranty backing provides excellent reliability assurance
– High quality standard typical of A-Premium products
– Wide compatibility for several Legacy engine configurations

Cons:
– Priced slightly higher than other basic replacement brands for older systems

Best for: Legacy owners (1997-2005) who are willing to pay a slight premium for high-quality construction and a solid warranty on the single coil pack.

Expert Opinion: A-Premium is a trusted name for aftermarket components. For this critical, central coil pack component, the unlimited mileage guarantee is a significant benefit, ensuring that your best ignition coil for subaru legacy will last.

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 into the modern era, A-Premium provides a complete kit for the newest generations of the Subaru Legacy 2.5L (2015-2019). This set includes four coil packs (replacing UF-774) and four premium iridium spark plugs. Iridium in this application ensures a stable idle speed, superior cold starts, and maximum performance. This is ideal if you are noticing the first signs of misfire or sluggish performance in your fifth or sixth-generation Legacy. The OE-compliant design means this kit bolts directly into the valve cover location with zero fuss.

Key features that stand out:
– Modern Fitment: Essential for 2015-2019 Legacy 2.5L models (UF-774 replacement).
– Iridium Spark Plug: Extends service life nearly threefold while improving fuel efficiency.
– Specifications: Coil features a 2-blade terminal and 12V operation.

Pros:
– Perfect for modern direct-injection 2.5L Boxer engines
– Comprehensive kit includes high-performance, long-lasting iridium plugs
– Backed by the robust A-Premium one-year unlimited-mileage warranty

Cons:
– Must confirm engine code, as this is only for the non-turbo 2.5L

Best for: Owners of 2015-2019 Legacy models seeking the best ignition coil for subaru legacy replacement kit that maximizes efficiency and plug lifespan.

Expert Opinion: For newer Subaru models, using high-quality components is non-negotiable to maintain ECU consistency. This A-Premium kit provides factory-level performance and simplifies maintenance by including the necessary iridium plugs.

Comparison Short Insights

When evaluating the best ignition coil for subaru legacy, compatibility with your specific engine (H4 2.5L vs. H6 3.6L) and model year is the most critical factor. Legacy models from 2005 to 2009 often use a single, central coil pack (UF-538/UF-566), making kits like the MOAUTO or TRQ extremely valuable as they include the necessary wires and plugs.

For the highly popular 2010–2012 Legacy 2.5L, which switched to four individual coil-over-plug units (UF-668), buying a 4-pack kit offers the best economy and consistent performance. The PHILTOP and LCWRGS kits provide the added benefit of including spark plugs, turning the coil replacement into a complete tune-up.

If you own the six-cylinder H6 3.6L Legacy, your options are more specialized. Products like the A-Premium H6 coil pack are necessary due to the distinct design and fitment required for the larger engine. Finally, for the newest 2015-2019 2.5L models, modern iridium plugs, found in the A-Premium UF-774 kit, are essential for maintaining fuel efficiency and meeting stringent emissions standards.

Final Verdict

Choosing the right components depends heavily on your Legacy’s generation and your personal maintenance philosophy (full overhaul vs. single repair).

For the 2010–2012 Legacy 2.5L Owner: The PHILTOP Set of 4 Ignition Coil Pack and Iridium Spark Plugs wins for Best Overall Value. You get reliable UF668 coils paired with the longevity of iridium plugs, minimizing future maintenance costs.

For the Classic Legacy Owner (2005–2009): The TRQ Ignition Kit is the winner for Best Comprehensive Overhaul. Since this generation relies on plug wires, replacing the coil, wires, and plugs simultaneously ensures the system is running like new.

For the H6 3.6L Engine Driver: We recommend the A-Premium Engine Ignition Coil Pack. Reliability is key for the 3.6L; A-Premium’s quality control and warranty provide the necessary assurance that your best ignition coil for subaru legacy is up to the task.

For the Latest Generation (2015-2019): The A-Premium Set of 4 Ignition Coil Pack and Iridium Spark Plugs (UF-774) is the ideal choice for maximizing performance and longevity in modern 2.5L engines.

Best Ignition Coil For Subaru Legacy FAQ

Q1: What are the common symptoms of a failing ignition coil in a Subaru Legacy?

A: The most common signs are engine misfires (often causing the check engine light to flash or illuminate P030X codes), rough idling, decreased fuel economy, a noticeable loss of power, and hesitation or sluggishness during acceleration. If you smell unburned fuel from the exhaust, that is also a strong indicator that the combustion is incomplete due to a weak spark.

Q2: Is it better to replace all the ignition coils at once, or just the failed one?

A: While you can replace just the faulty unit, most experts recommend replacing all coils simultaneously, especially on models (2010 and newer) that use individual coil-over-plug systems. Ignition coils typically age at the same rate. Replacing only one means the remaining older coils are likely close to failure, leading to repetitive repair work. Purchasing a 4-pack coil set generally offers a significant cost saving compared to buying individual units over time.

Q3: How do I know if my Legacy uses a single coil pack or individual coil-over-plug units?

A: This depends on the engine generation. Older Subaru Legacy 2.5L models (typically up to 2009) use a single, central ignition coil pack that feeds spark to the four cylinders via plug wires. Newer Legacy 2.5L models (2010 and later) use individual coil-over-plug units, meaning there is one coil directly mounted above each spark plug. The H6 3.6L engine always uses individual coil-over-plug units.

Q4: What is the average lifespan of a Subaru Legacy ignition coil?

A: Original Equipment Manufacturer (OEM) coils typically last between 80,000 to 100,000 miles. However, high heat, poor-quality spark plugs, and driving conditions can shorten this lifespan. High-quality aftermarket best ignition coil for subaru legacy replacements (especially those with superior copper windings) should meet or exceed that range.

Q5: Can I install a replacement ignition coil pack myself?

A: Yes, replacing the ignition coil pack is generally considered a straightforward DIY repair for most Subaru Legacy models. The process usually involves removing a few bolts and disconnecting the electrical connector. Ensure the engine is cool, disconnect the negative battery terminal, and use dielectric grease on the new coil boots for a better seal.

Q6: What role do spark plugs play when replacing ignition coils?

A: The coil generates the energy, and the spark plug delivers the spark. If the spark plugs are old or worn, they can put undue stress on the new ignition coils, potentially causing premature failure. Therefore, it is highly recommended to replace the spark plugs at the same time as the ignition coils—which is why many of the best ignition coil for subaru legacy options reviewed are sold as comprehensive kits.