A Guide to Spark Plugs for the 2016-2024 Subaru Crosstrek
Keep your Crosstrek's boxer engine running smoothly with the right set of new aftermarket spark plugs.
- Replace your Crosstrek's spark plugs every 60,000 miles as recommended by Subaru.
- Use only high-quality Iridium spark plugs from brands like NGK or Bosch; NGK is the OEM supplier.
- The replacement job is more difficult than on other cars due to the boxer engine design, which increases labor costs.
- A recall for ignition coils on 2018-2019 models may be relevant as the coils must be removed for plug replacement.
Signs of Failing Spark Plugs in Your Crosstrek
When spark plugs wear out, they give several warning signs. Ignoring them can lead to bigger problems, like damage to your catalytic converter. If you notice any of these symptoms, it might be time for a new set of plugs.
- Rough Idling: Your car may shake or vibrate, and the engine will sound uneven when you're stopped.
- Engine Misfires: You might feel the engine stutter or hesitate, especially when accelerating. A flashing check engine light often indicates a misfire.
- Reduced Power: Your Crosstrek may feel sluggish and slow to accelerate.
- Worse Gas Mileage: Worn plugs are less efficient at burning fuel, so you'll find yourself filling up the tank more often. 🎬 Watch: See these common symptoms of bad spark plugs in action.
- Difficulty Starting: If the engine cranks longer than usual before starting, weak spark plugs could be the cause.
When to Replace Your Spark Plugs
Subaru recommends replacing the spark plugs in the Crosstrek every 60,000 miles or 60 months, whichever comes first. Sticking to this schedule is important for maintaining engine performance and preventing more costly repairs down the road. Using high-quality iridium spark plugs helps ensure they last for this full interval.
Known Issues: Ignition Coil Recall
Subaru issued a recall (NHTSA ID: 21V-264) for certain 2018-2019 Crosstrek models related to the ignition coils and Engine Control Module (ECM) programming. The issue could cause a short circuit, leading to sudden loss of engine power. The recall involves replacing all four ignition coils and updating the ECM software. While this recall is for the ignition coils, not the spark plugs themselves, the coils must be removed to replace the plugs, making it a good time to have the recall performed 🎬 Watch: This step-by-step guide shows how to replace 2018-2023 plugs. if it hasn't been already.
Choosing the Right Aftermarket Spark Plugs
When shopping for new spark plugs, you'll find several types and brands. For the 2016-2024 Crosstrek, using the correct type is essential for performance and engine health.
OEM-Equivalent (Best Quality)
NGK Laser Iridium: NGK is the original equipment manufacturer (OEM) for Subaru, meaning the plugs you buy from the dealer are made by NGK. Aftermarket NGK Laser Iridium plugs are often identical to the genuine Subaru parts. They feature an iridium-tipped center electrode and a platinum ground electrode, providing excellent durability, consistent performance, and a long service life that matches the 60,000-mile replacement interval. For most Crosstrek owners, these are the best and most reliable choice.
Performance Aftermarket (Good Quality)
Bosch Iridium: Bosch offers high-quality iridium spark plugs that are a great alternative to NGK. They are known for durability and can sometimes be slightly more affordable than their NGK counterparts. While NGK is the preferred brand for many Japanese vehicles like Subaru, Bosch plugs are a solid choice that will meet or exceed the performance needs of your Crosstrek's engine.
Standard Aftermarket (Good Quality)
Champion Iridium: Champion also produces iridium spark plugs that are compatible with the Crosstrek. They are a reputable brand and offer a reliable option that often comes at a competitive price point. While not the OEM supplier, their iridium plugs are designed for modern engines and provide a good balance of performance and value.
Iridium is Key
Your Crosstrek's engine is designed specifically for long-life iridium spark plugs. Do not use cheaper copper or standard platinum plugs. While they might fit, they will not perform as well and will wear out much faster, potentially causing engine problems. Modern iridium plugs come pre-gapped from the factory and should not be adjusted with a traditional gapping tool, as this can damage the fine iridium tip.
Cost of Replacing Subaru Crosstrek Spark Plugs
| Part Type | Cost Range (4 Plugs) |
|---|---|
| New Aftermarket (NGK, Bosch, Champion) | $32 - $125 |
| New OEM | $80 - $145 |
| Shop Labor | $200 - $400 |
Frequently Asked Questions (FAQ)
Why is the replacement cost so high at a dealership?
The boxer engine design places the spark plugs on the sides of the engine, close to the frame rails. This makes access difficult, especially for the rear plugs. Mechanics may need to remove the air intake box on the passenger side and the battery on the driver's side to get enough room. This extra labor time increases the cost compared to an engine where the plugs are on top.
Can I change the spark plugs myself?
Yes, it is a DIY-feasible job if you have the right tools and patience. You will need a 14mm thin-wall spark plug socket, a universal/wobble socket extension, and various socket extensions. The driver's side rear plug is notoriously the most difficult to access. If you are not experienced, it may be best to leave this job to a professional to avoid damaging the threads 🎬 See this replacement walkthrough for 2013-2015 Crosstrek models. in the engine block.
Do I need to put anti-seize on the new spark plugs?
No. Major manufacturers like NGK apply a special trivalent metal plating to their plugs that acts as an anti-seize and prevents corrosion. Adding more anti-seize can lead to over-torquing the spark plug, which can damage the plug or the engine's cylinder head.
What is the difference between the 2.0L and 2.5L engine spark plugs?
The 2.0L and 2.5L engines used in the Crosstrek may use different spark plug part numbers. It is critical to verify the correct part number for your specific year and engine size before purchasing. Using the wrong plug can lead to poor performance or engine damage.
Helpful Videos
Technical Specifications
OEM Part Numbers: 22401AA940 22401AA781 22401AA820 22401AA880 22401AA95A
Material: Iridium/Platinum Hex Size: 14mm Pre-Gapped: Yes (Typically 0.032 inches or 0.8mm)
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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.
- Subaru Crosstrek: