How often should you change your spark plugs on a Subaru Crosstrek?
The typical guideline for modern Crosstrek models is about 100,000 miles between spark plug changes under normal driving conditions. The exact interval can vary based on engine type, year, and how you drive.
The Crosstrek has evolved from earlier engine designs to newer FB and FA families, which use longer-life plugs. This article outlines current recommendations, factors that can affect timing, common warning signs, and practical steps for replacement.
Recommended replacement intervals
The following guidance covers the common engines found in recent Crosstrek models (FB20 2.0L and FA25D 2.5L). For older EJ engines, intervals may differ and are often shorter.
- Normal driving: about 100,000 miles (160,000 km) when using iridium or other long-life spark plugs.
- Severe driving conditions (frequent short trips, extreme temperatures, heavy towing, or lots of city traffic): the interval may shorten to roughly 60,000–90,000 miles (97,000–145,000 km), depending on plug type and engine wear.
- Plug type matters: copper plugs typically require earlier replacement (roughly 30,000–60,000 miles), while platinum/iridium plugs are designed for longer life (often nearing 100,000 miles or more).
- Always refer to your specific owner’s manual or service schedule for the exact interval for your year and engine variant.
In practice, many Crosstrek owners follow about a 100,000-mile schedule under normal use, but driving style, climate, and engine variant can shift this window significantly.
What affects the replacement interval
Several factors can shorten or extend spark plug life in a Crosstrek. Understanding them helps you plan maintenance more accurately.
- Engine family and spark plug type (FB20/FA25D with iridium or platinum plugs versus older copper plugs).
- Driving conditions (long highway trips vs. frequent short trips in city driving).
- Climate and environment (extreme heat, cold, or dusty conditions).
- Fuel quality and octane as well as consistent ignition system maintenance.
- Vehicle mileage and overall wear on the engine, including coil packs and ignition wires.
Because these factors vary by driver and region, your exact replacement timing may depart from the general 100,000-mile baseline.
Signs your spark plugs may need replacement
Stopping to listen for and watch for warning signs can prevent rough running and potential engine damage. Consider these indicators as plugs approach the end of their life.
- Rough idle or engine misfires, especially during acceleration.
- Reduced fuel efficiency or noticeable drop in performance.
- Hard starting or extended cranking to start the engine.
- Engine knocking or pinging under load, or a rising cold-start idle.
- Check Engine Light with codes related to misfire or ignition as a possible symptom.
If you notice any of these symptoms, have the ignition and fuel systems tested. Worn plugs are a common cause of misfires and poor performance, but other issues can also trigger similar symptoms.
How to check and replace spark plugs (high level)
Replacing spark plugs is a moderate-to-high-skill maintenance task. Use the vehicle’s service manual as the primary reference and follow model-specific steps and torque specs.
- Gather the correct replacement plugs (OEM or equivalent iridium/platinum plugs) and the proper tools for your Crosstrek’s engine.
- Disconnect the negative battery terminal, then access the spark plugs by removing ignition coils or spark plug wires as required by your model year.
- Carefully remove each old plug, clean the wells, and inspect for damage or fouling.
- Gap the new plugs to the manufacturer’s specification, thread them in by hand to avoid cross-threading, then tighten to the recommended torque.
- Reassemble ignition components, reconnect the battery, and run the engine to verify smooth operation.
Because procedures and torque specifications vary by year and engine type, consult your owner’s manual or a trusted technician for model-specific guidance.
Choosing the right plugs
Use OEM or equivalent long-life iridium/platinum spark plugs recommended for your Crosstrek’s engine. Adhering to the specified gap and torque helps ensure optimal performance and longevity.
Summary: For most modern Subaru Crosstrek models, plan for spark plug replacement around 100,000 miles under normal driving, with the interval potentially shorter under severe conditions or for older plug types. Monitor performance and consult the owner’s manual for your exact model/year. When in doubt, have a technician inspect to determine whether replacement is needed.
Bottom line: The standard expectation is roughly 100,000 miles between changes for the Crosstrek’s current engines, but real-world factors can shorten or extend that interval. Stay aligned with the manual and seek professional guidance if you notice signs of wear or performance issues.
How much does it cost to replace spark plugs in a Subaru Crosstrek?
The cost to replace the spark plugs on a Subaru Crosstrek typically ranges from $450 to $900, with a majority of quotes falling between $530 and $800. Prices vary depending on the service provider (dealership vs. independent mechanic) and the model year, with the 2020 and 2021 models generally being less expensive than older models.
This video explains how to replace the spark plugs on a Subaru Outback, which can give you an idea of the process involved: 30sMrSubaru1387YouTube · Jan 9, 2022
Factors affecting the cost
- Labor: The difficulty of accessing the spark plugs is a significant cost driver. For some Crosstrek models, accessing the rear driver-side spark plug can be particularly time-consuming.
- Parts: The cost of the spark plugs themselves can range from about $5 to $50 each, depending on the type. Subaru genuine parts can be more expensive.
- Service provider:
- Dealerships: often have higher labor rates but use manufacturer-recommended parts and have highly trained technicians, which may include a warranty on parts and labor.
- Independent shops: may have lower labor rates and use aftermarket parts, which can result in a lower overall price.
- Model Year: Newer models like the 2020 and 2021 Crosstrek are estimated to be less expensive than older models, potentially due to easier access or updated designs.
What to do
- Get multiple quotes: Obtain quotes from both a dealership and a reputable independent shop to compare prices.
- Consider DIY: If you are comfortable with car maintenance, you can save on labor costs by doing it yourself, though it requires the right tools and some mechanical knowledge.
- Know your vehicle's needs: Be sure to use the correct spark plug part number for your specific model year and engine to ensure proper performance and longevity.
How do I know if my Subaru spark plugs are bad?
One of the first signs of spark plug wear is trouble starting your Subaru. If the engine cranks longer than usual before starting or if you experience intermittent starting issues, it's time to inspect your spark plugs.
What year to stay away from a Subaru Crosstrek?
Years to potentially avoid for the Subaru Crosstrek include the 2016 and 2018 models due to issues like drivetrain vibrations, infotainment problems, and oil consumption. The early years of the first generation, specifically 2013-2015, should also be approached with caution due to common issues like oil consumption and head gasket problems with the 2.5-liter engine.
Years with more reported issues
- 2016: Has been associated with drivetrain vibrations and faulty infotainment systems.
- 2018: This model year is known for excessive oil consumption, glitchy technology, and a serious safety concern regarding the rear wheels kicking out, causing fishtailing.
- 2013-2015: These early models, particularly with the 2.5L engine, are prone to head gasket problems and excessive oil consumption. The 2012 Impreza shared this generation and also had issues with its CVT and oil consumption.
Other years to consider
- 2017: Generally considered a safer bet with fewer reported issues and recalls.
- 2019: While some sources suggest avoiding it due to numerous recalls and a significant number of complaints related to the ECM software causing unexpected engine stalls, other owners have reported it as reliable.
- 2021: This model year has received positive marks for reliability.
- 2023: This year is often recommended as one of the better choices in the second generation.
How long do spark plugs last on a Subaru Crosstrek?
30,000 to 60,000 miles
Subaru recommends specific intervals for changing your spark plugs to maintain peak engine performance and efficiency. You generally replace spark plugs every 30,000 to 60,000 miles, depending on your particular Subaru model and engine type.
