For a Subaru Impreza in 2026, the best spark plugs come down to OEM Subaru, NGK copper, and iridium or double-iridium options.
OEM plugs offer a direct fit, while NGK copper plugs give solid, steady performance.
Iridium types last longer and help with cleaner starts.
The right choice depends on your engine, turbo setup, thread, reach, gap, and torque.
| KAX Ignition Coils and Spark Plug Set for Subaru |
| Best Coil Set | Plug Type: Double iridium | Pack Size: 4-pack | Brand: KAX | VIEW LATEST PRICE | Read Our Analysis |
| BDFHYK Ignition Coil Pack & Spark Plugs for Subaru |
| Durable Upgrade | Plug Type: Iridium | Pack Size: Set of 4 | Brand: BDFHYK | VIEW LATEST PRICE | Read Our Analysis |
| KAX Ignition Coil Pack and Spark Plugs |
| Best for Older Models | Plug Type: Iridium | Pack Size: 4 coils + 4 plugs | Brand: KAX | VIEW LATEST PRICE | Read Our Analysis |
| A-Premium Iridium Spark Plugs for Toyota Hyundai Subaru Honda |
| Wide Compatibility | Plug Type: Iridium | Pack Size: 4-pack | Brand: A-Premium | VIEW LATEST PRICE | Read Our Analysis |
| NGK Spark Plug BKR5E-11- Set of 4 |
| OEM Replacement | Plug Type: Copper | Pack Size: Set of 4 | Brand: NGK | VIEW LATEST PRICE | Read Our Analysis |
| Subaru OEM Spark Plugs for Forester Impreza Crosstrek |
| Genuine Subaru OEM | Plug Type: Iridium-tipped | Pack Size: Set of 4 | Brand: Subaru | VIEW LATEST PRICE | Read Our Analysis |
More Details on Our Top Picks
KAX Ignition Coils and Spark Plug Set for Subaru
Should you drive a 2013 to 2015 Subaru Impreza, this KAX set is a smart coil set upgrade. You get four UF710 ignition coils and four double iridium spark plugs, plus direct-fit, vehicle-specific compatibility. That means less guesswork and fewer cuss words in the driveway.
The coils deliver strong voltage for cleaner combustion, smoother running, and quicker 0.1 to 0.2 second startup response. Installation’s simple: unplug the old parts, connect the new ones, and move on. OEM numbers, like 22433AA650 and UF737, help you match fitment fast. Warranty coverage runs 2 years.
- Plug Type:Double iridium
- Pack Size:4-pack
- Brand:KAX
- Fitment:Subaru Impreza 2013–2015
- OEM Reference:UF710 / 93501
- Warranty:2 years
- Additional Feature:Double iridium plugs
- Additional Feature:0.1-second startup
- Additional Feature:Tool-free connection
BDFHYK Ignition Coil Pack & Spark Plugs for Subaru
Need a direct-fit durable upgrade for your Subaru? The BDFHYK UF724 coil pack and 93501 iridium plugs fit your 2013 to 2015 Impreza, plus other 2.0L and 2.5L Subaru models. You get a vehicle-specific, screw-in or bolt-on replacement with a male connector, silicon steel core, Japan-imported rubber seals, and German varnished wire.
The iridium plugs use a ceramic insulator for quicker starts and smoother pull. Check OE numbers UF724, C974, 5C1899, COP626, 49131, 93501, LKAR7BIX-11S initially. After 80,000 km, your Subaru might thank you.
- Plug Type:Iridium
- Pack Size:Set of 4
- Brand:BDFHYK
- Fitment:Subaru Impreza 2013–2015
- OEM Reference:UF724 / 93501
- Warranty:1 year
- Additional Feature:Silicon steel core
- Additional Feature:Japan-imported rubber
- Additional Feature:Germany varnished wire
KAX Ignition Coil Pack and Spark Plugs
KAX’s coil-and-plug kit fits older Impreza models neatly. You get 4 UF664 coils, 4 iridium plugs, and a magnetic 3/8″ sleeve, so installation stays simple: unplug the old parts, connect the new ones, and move on with your day.
It fits the 2012 Impreza 2.0L, and also some 2011 to 2012 Forester 2.5L models. The magnetic tip helps keep plugs from vanishing into the engine bay, which is rude of them. For a direct OEM-style swap, this 8.46 x 7.28 x 2.83-inch kit makes sense.
- Plug Type:Iridium
- Pack Size:4 coils + 4 plugs
- Brand:KAX
- Fitment:Subaru Impreza 2012
- OEM Reference:UF664 / 93501
- Warranty:Available
- Additional Feature:Magnetic socket sleeve
- Additional Feature:Anti-slip hex design
- Additional Feature:3/8-inch drive
A-Premium Iridium Spark Plugs for Toyota Hyundai Subaru Honda
A-Premium iridium spark plugs offer wide compatibility for Subaru Impreza drivers and more. You get a 4-pack built with an iridium tip and platinum core, plus a 5,000-ohm resistor for steady spark control. The plugs use a 14 mm thread, 5/8 in hex, 0.75 in reach, and a 0.039 to 0.044 in gap.
They fit many 4-cylinder engines, including L4 and H4 layouts, across Subaru, Toyota, Honda, and Hyundai models. Confirm your exact fit with your vehicle tool initially. Replace them around 80,000 to 100,000 miles. Nice and boring, which is exactly what ignition should be!
- Plug Type:Iridium
- Pack Size:4-pack
- Brand:A-Premium
- Fitment:Subaru Impreza
- OEM Reference:Multiple cross-refs
- Warranty:Not listed
- Additional Feature:Platinum core
- Additional Feature:5000-ohm resistance
- Additional Feature:0.039-0.044 gap
NGK Spark Plug BKR5E-11- Set of 4
NGK BKR5E-11 plugs give your Impreza an OEM replacement you can trust. You get a set of 4 from NGK Japan, part number 6953, with 14 mm threads and a copper core for solid everyday performance. They match OEM-equivalent 130-843, so they’re a smart pick whenever you want factory-style reliability without drama.
Before you buy, check NGK’s application guide for your exact engine and drivetrain, because fit matters more than hopeful thinking. You’ll also get warranty support and a return window on many orders. Simple, dependable, and invigoratingly unexciting!
- Plug Type:Copper
- Pack Size:Set of 4
- Brand:NGK
- Fitment:Vehicle specific
- OEM Reference:6953 / 130-843
- Warranty:Manufacturer warranty
- Additional Feature:Copper core
- Additional Feature:Metal top material
- Additional Feature:OEM quality
Subaru OEM Spark Plugs for Forester Impreza Crosstrek
Need a factory-correct swap? Subaru’s OEM iridium spark plugs, part 22401AA781, give you the exact match for many Forester, Impreza, Legacy, Outback, and Crosstrek models. You get a set of 4, sealed and ready for non-turbo 2011 to 2019 engines like EJ25B and EJ20B.
Fitment includes:
- Forester 2.5, 2011 to 2018
- Impreza 2.0, 2012 to 2016
- Crosstrek 2.0, 2013 to 2016
And yes, they’re genuine Subaru, with a 4.8-star average from 85 reviews. Nice, boring reliability, which is exactly the point!
- Plug Type:Iridium-tipped
- Pack Size:Set of 4
- Brand:Subaru
- Fitment:Subaru Impreza 2012–2016
- OEM Reference:22401AA781
- Warranty:Manufacturer warranty
- Additional Feature:Genuine Subaru OEM
- Additional Feature:Iridium-tipped design
- Additional Feature:Sealed spark plugs
Factors to Consider When Choosing Spark Plugs for Subaru Impreza
Whenever you pick spark plugs for your Subaru Impreza, start with engine fitment and the OEM part match, because the wrong plug can fit about as well as a square peg in a round hole. Then look at iridium tip quality, the heat range, and the electrode gap, since those details affect how cleanly your engine fires and how long the plugs hold up. A correct gap and the right heat range keep things smooth, efficient, and far less annoying than a rough idle on a Monday morning!
Engine Fitment
Spark-plug fitment isn’t just a parts-store guessing game, especially on a Subaru Impreza. You need to confirm your engine code and displacement initially, because a 2.0L H4 and a 2.5L H4 can call for different thread size, reach, and heat range. Check the cylinder-head spec too: many flat-fours use a 14 mm thread with about 0.75 in reach, but year-to-year changes happen.
And don’t skip turbo status. Turbo engines usually want a different heat range and tougher electrode materials for hotter combustion. Then verify the gap and material match your variant, since iridium, platinum, and copper aren’t interchangeable. Should you be changing coils too, make sure the plug body and boot seat cleanly. Tiny mismatch, big headache!
OEM Part Match
A good OEM match takes the guesswork out of your Subaru Impreza’s spark plugs, and that starts with the exact part number in your service manual or parts catalog. Use it, not a close cousin. Match the thread diameter, usually 14 mm, plus the hex size and reach so the plug seats fully and doesn’t poke where it shouldn’t.
- Confirm the OEM-specified electrode material, often fine-gap iridium on many non-turbo engines.
- Check the factory gap spec, then buy pre-gapped plugs or set them exactly before installation.
- Pick an OEM-equivalent listed for your model year and engine code.
Do that, and you keep emissions, fuel economy, and drivability on track. Easy wins, fewer headaches, and no mystery misfires!
Iridium Tip Quality
Choose a plug with a truly good iridium tip, because that tiny center electrode does a lot of heavy lifting in your Subaru Impreza. You want a fine-wire tip, usually about 0.4 to 0.7 mm, because it needs less ignition voltage and makes a tighter, cleaner spark. That helps cold starts and snappier throttle response. Look for high-purity iridium and solid welding to the core, since weak bonding can widen the gap and mess with long-term consistency. Good tip geometry matters too:
- Smooth, concentric construction supports steady spark timing.
- Strong corrosion resistance helps cut fouling and misfires.
- Durable tips can last roughly 80,000 to 100,000 miles.
And yes, that’s a long stretch for a tiny part.
Heat Range
Upon reaching heat range, you’re really deciding how quickly the plug sheds combustion heat into the cylinder head, and that matters a lot in your Subaru Impreza. A hot plug holds more heat at the tip; a cold plug moves it away faster. You want the sweet spot: cool enough to avoid pre-ignition or detonation, but warm enough to keep fouling away.
Should you drive hard, run forced induction, spin high RPMs, tow, or raise compression, step a bit colder. Iridium and platinum plugs could run slightly colder than copper-core plugs with the same number, thanks to their design. Stick within Subaru’s recommended range, and don’t jump more than one step either way. That’s how you keep the engine happy, not dramatic!
Electrode Gap
Dial in the electrode gap, and your Subaru Impreza will thank you with cleaner starts and steadier combustion. For many non-turbo engines, you’re usually aiming for about 0.7 to 0.8 mm, but your service manual wins every argument. Iridium and platinum plugs often arrive close to spec, yet a tiny ±0.01 mm tweak can make ignition happier and misfires less likely. Too wide? The coil works harder. Too narrow? Combustion gets lazy, and fuel economy can sulk.
- Check the gap cold.
- Use a feeler gauge or non-round gap tool.
- Apply only light pressure; those fine center electrodes dislike rough handling.
After installation, watch for rough idle, weak acceleration, or rising fuel use, and recheck the gap provided those symptoms hang around.
Service Interval
Once you’ve got the gap set correctly, the next big question is how long those plugs should stay in your Impreza before you replace them. Use your owner’s manual firstly. For many modern Subaru four-cylinder engines, inspect plugs around 60,000 miles, then plan replacement provided 80,000 to 100,000 miles provided they’re iridium or platinum.
Copper plugs usually want attention much sooner, around 20,000 to 30,000 miles, because they’re lively but short-lived, like that one friend who never charges their phone. Should you drive mostly short trips, idle a lot, tow, or live in dust, cut that interval by 20% to 50%. And provided you notice rough idle, misfires, hard cold starts, or worse fuel economy, replace them sooner. Check wear, fouling, and gap erosion!
Coil Compatibility
Keep the spark plug and the coil speaking the same language, because mismatched parts can cause weak sparks, rough running, or misfires you really didn’t invite. Match the terminal style and resistance to your coil, whether it permits a resistor plug or a specific ohm value, so the signal stays clean.
Check these basics:
- Reach and thread diameter must fit the head.
- Heat range should suit the coil’s firing energy and your engine’s temperature.
- Keep the electrode gap within the coil maker’s spec, or the coil might work overtime.
- On coil-on-plug setups, make sure the insulator nose and overall length let the boot seat fully.
Get these details right, and you’ll keep spark delivery steady, efficient, and drama-free.
Installation Ease
Because spark plug installation in a Subaru Impreza can get cramped fast, you’ll want plugs that match the engine’s thread diameter, reach, and hex size right away, so they thread in smoothly without adapter tools or a heroic amount of patience. Confirm the common 14 mm thread and about 0.75 inch reach, then check for a 5/8″ hex that your socket can grab cleanly. A pre-set gap, or one you can adjust easily to factory spec, saves you from wrestling with a feeler gauge in a tight head.
- Use a long, thin spark-plug socket.
- Hand-start every plug before torquing it.
- Finish with a torque wrench and the listed Nm value.
Look for a firm insulator shoulder too; it helps you seat the plug cleanly and avoid cross-threading.
Final Thoughts
In the end, you’ll want spark plugs that match your Impreza’s engine, driving style, and service goals. Choose OEM for a no-drama fit, NGK for dependable copper performance, or iridium and coil-pack kits whenever you want longer intervals and stronger starts. Check the code, gap, and torque, then install the right set with care. Do that, and your engine will run like a clean, well-tuned orchestra, not a caffeinated lawn mower.
