How much to replace spark plugs on wrx?

On a typical WRX, expect roughly $150–350 for a spark plug replacement at an independent shop, with dealer pricing often higher. This estimate covers four plugs, labor, and basic inspection. The exact price depends on the engine version, plug type, and local labor rates.

Replacing spark plugs involves removing ignition coils, threading in four new plugs, and re-torquing to specification. Subaru’s WRX lineup uses four-cylinder engines that have evolved from the 2.0-liter FA20 to the 2.4-liter FA24 in newer generations, with iridium or platinum plugs that generally require replacement around 60,000 miles, depending on driving conditions and plug type. Costs vary based on plug quality, whether ignition coils are reused or replaced, and the service location.

What affects the cost

The amount you pay for a spark plug replacement is driven by several factors: engine type, plug type, labor rate, and whether other ignition components are replaced. Here is how these factors typically influence the price:

• Plug type and part price: OEM iridium/platinum plugs cost more per plug than copper or budget aftermarket options.


• Labor time and shop rate: Turbo engines with tighter access can take longer, and dealer service centers generally charge higher hourly rates.


• Coil packs and related hardware: If worn or damaged coils or boots are found, shops may replace them, adding to parts and labor costs.


• Additional diagnostics or services: If a misfire is detected or other ignition-related issues are suspected, diagnostic fees may apply.

Understanding these factors helps you estimate total costs and plan accordingly.

Cost estimates by engine version

Note that the WRX has transitioned from a 2.0-liter turbo engine (FA20) in older generations to a 2.4-liter turbo (FA24) in newer models. Access, recommended plug type, and labor time can differ between these versions.

• Independent shop (typical, four plugs): Parts $32–$60; Labor $120–$200; Total installed: $152–$260.


• Dealership/service center (typical, four plugs): Parts $32–$60; Labor $180–$320; Total installed: $212–$380.


• Specialty/high-cost markets or performance shops: Parts $32–$60; Labor $200–$460; Total installed: $232–$520.

In practice, many WRX owners pay toward the lower end if they bring their own parts and choose a quick turnaround shop, while dealer or high-demand markets can push total costs higher. Always request a written quote that lists parts, labor, and any potential add-ons before the work begins.

Plug types and replacement intervals

Most WRX models use iridium or platinum plugs with a replacement interval commonly around 60,000 miles, though newer FA24 variants can extend toward 90,000–100,000 miles depending on plug design and driving conditions. Always follow the owner’s manual for the recommended heat range and interval, and consider a proactive inspection if you notice rough idle, misfires, or reduced performance.

Tips to save money and ensure a quality job

These practical tips can help you keep costs reasonable without compromising reliability.

• Use the recommended plug type from Subaru’s manual or opt for OEM-equivalent iridium/platinum plugs.


• Shop around: get quotes from multiple independent shops and compare with dealer estimates.


• Ask for a bundled price that includes parts, labor, and a coil/boot inspection.


• Consider timing the plug replacement with other routine maintenance if it makes sense for your schedule and vehicle condition.

By following these steps, you can secure a fair price while ensuring the job is done correctly.

Summary

For a Subaru WRX, spark plug replacement costs typically range from about $150 to $350 at independent shops and around $250 to $450 at dealers, depending on whether your car uses the 2.0L FA20 or 2.4L FA24 engine, the plug type, and local labor rates. The service covers four plugs, with potential additional costs if ignition coils or boots need replacement. Always use the manufacturer-recommended plug type and interval, and obtain a written quote that details parts and labor to avoid surprises.

How often should I change spark plugs on my WRX?

every 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.

Why are Subaru spark plugs so expensive?

Subaru spark plugs are expensive due to the significant labor involved in replacing them and the cost of the specialized, long-life iridium spark plugs used in most models. The unique boxer engine configuration places the spark plugs on the sides, requiring mechanics to lift the engine or partially disassemble other components to access them. This difficulty and the use of high-quality parts drive up the total cost.
 
Labor costs

• Difficult access: The boxer engine's flat, opposed cylinders mean spark plugs are located low down near the frame rails, unlike many inline engines where they are on top.
• Time-consuming replacement: Accessing the plugs can require significant labor, such as unbolting the engine from its mounts and carefully lifting it slightly to create enough space.
• Increased hourly rates: The extended time needed for the job results in higher overall labor costs from dealerships or independent mechanics who charge by the hour. 

Part costs

• Premium materials: Subaru uses premium iridium or platinum spark plugs, which are more expensive than standard copper plugs but offer a longer lifespan, often exceeding 100,000 miles. 
• Precise manufacturing: These plugs are manufactured with high precision to meet Subaru's specific engine requirements, which adds to their cost. 

Other factors

• Bundled services: Dealerships sometimes bundle spark plug replacement with other maintenance tasks for the 60,000-mile service, making the final bill appear higher. 
• Dealer markup: While the parts themselves are more costly, the primary reason for the high price is the labor involved, and dealership labor rates are often higher than those at independent shops. 

How much to change spark plugs wrx?

A Subaru WRX spark plug change costs roughly $400-$900, depending on the year and shop, with professional estimates often ranging from $550 to $850. The cost varies based on the model year, which affects labor time, and the shop's hourly rate. Doing the job yourself with parts costing about $70-$100 is a much cheaper alternative if you have the right tools and mechanical inclination. 
Professional service cost

• $400-$900: Typical range:
• Estimates for specific years:
  • 2013-2014 WRX: $674.80 to $893.20 
  • 2015-2021 WRX: $635.12 to $839.12 
  • 2018 WRX: $662.00 to $828.05 
• Factors: Labor is the main cost, as some WRX models require more time due to access difficulty. 

DIY cost

• Parts cost: Around $70-$100 for the spark plugs themselves, depending on the brand. 
• Tool cost: An estimated $40-$100 for the necessary tools, depending on what you already own. 
• Time: Typically a 2.5-hour job for someone with experience and the right tools, though it can be a frustrating job for some. 

What to consider

• Model year: Check the specific labor time and part costs for your WRX's year, as they can differ significantly. 
• Shop vs. DIY: Consider your mechanical skill level and whether you want to invest in the tools needed for the job. A DIY approach will save you a significant amount of money on labor. 

Do I really need to change my spark plugs at 100,000 miles?

Yes, replacing spark plugs at 100,000 miles is a common and often necessary maintenance task, as many modern vehicles have spark plugs rated to last that long. However, the exact interval depends on your vehicle's make, model, and the type of spark plug installed, so you should always check your owner's manual for the manufacturer's specific recommendation. 
This video explains when to change spark plugs and what happens if you don't: 1mHonest Mechanic ColoradoYouTube · Dec 24, 2023
Why it's important

• Engine performance: Spark plugs that are past their prime can cause rough idling, poor acceleration, and decreased fuel efficiency. 
• Preventing damage: Over time, worn-out plugs can put extra stress on other components, like ignition coils, and may seize in the engine block, making them harder to remove later. 
• Preventative maintenance: Replacing spark plugs is a form of preventative maintenance that can prevent more costly repairs down the line. 

This video explains why it's important to change spark plugs at 100k miles: 52sWhite One Auto, LLCYouTube · May 19, 2021
What to consider

• Owner's manual: Your vehicle's owner's manual is the most reliable source for the correct replacement interval and recommended plug type. 
• Spark plug type: The lifespan of spark plugs varies by material. Iridium plugs are often rated for 100,000 miles or more, while other types like copper or platinum have shorter lifespans. 
• Driving conditions: Severe driving conditions can shorten the life of spark plugs, so your interval may be shorter than recommended if you frequently tow, drive in extreme temperatures, or frequently start and stop.