How much to change spark plugs in a Subaru?
In most Subarus, a spark plug replacement typically runs about $150 to $600 in total, depending on the model, the type of plugs used, and whether you go to a shop or do the job yourself. Four-cylinder engines usually cost less than six-cylinder or turbocharged configurations. Doing it yourself can further reduce costs to the price of parts alone.
What affects the price
Costs are driven by several factors, including engine configuration, plug type, and labor rates. The following list outlines the main price drivers you’ll encounter when budgeting for a spark plug change.
- Engine configuration and plug accessibility: how many cylinders and how easily you can reach the plugs. Turbocharged or older, more tightly packed engines may require more work.
- Plug type and price: copper, platinum, or iridium plugs have different lifespans and costs. Iridium and platinum plugs last longer but cost more per plug upfront.
- Labor rate and time: dealer service departments tend to charge more per hour than independent shops, and some engines take longer to service due to access issues.
- Associated parts and services: coil packs, gaskets or seals, and any required intake or manifold adjustments can add to the bill if they’re needed or recommended.
In short, the price is largely tied to how easy or difficult the engine layout is and what kind of plugs you pick. The more complicated the access and the higher the price of the plugs, the higher the total cost.
Typical cost ranges by engine type
Here are rough ranges you can expect for common Subaru configurations. Prices vary by region and shop, but these figures give a practical ballpark for planning.
- 4-cylinder non-turbo (examples: Impreza, Forester, Outback with 2.0L/2.5L): Parts roughly $15–$60; labor about 0.5–1.5 hours; total typically $100–$250.
- 4-cylinder turbo or 2.0L turbo variants (WRX, some Forester/XT engines): Parts roughly $25–$100; labor about 1–2.5 hours; total typically $160–$360.
- 6-cylinder or older flat-six engines (less common in new Subarus, e.g., older 3.6R): Parts roughly $40–$120; labor about 1–2.5 hours; total typically $180–$450.
- Dealer vs independent shop: Dealer service tends to be higher by 20–40% and may push totals toward the upper end of these ranges.
Note that these are ballpark numbers. If your engine has tight access, or if a shop recommends replacing related components (like coil packs) or performing additional tests, the price can climb. Conversely, DIYers who purchase parts and perform the job themselves can substantially reduce the bill by eliminating labor costs.
DIY considerations
Replacing spark plugs yourself can save money, especially on straightforward, accessible engines. Assess your mechanical comfort level, tools, and the risk of cross-threading or damaging coil boots. If you choose to DIY, ensure you use the correct type of plugs for your engine, follow the manufacturer’s torque specifications, and consult the owner’s manual or a service manual for your exact model.
For many Subaru owners, a straightforward four-cylinder with accessible coils is a good candidate for a DIY replacement, while turbocharged or tightly packaged engines may be better left to a professional shop to avoid potential complications.
Summary
Budget guidance for a Subaru spark plug replacement typically ranges from about $100 to $250 for standard four-cylinder, naturally aspirated models when using affordable plugs and DIY or budget-friendly shops. Turbocharged and/or six-cylinder configurations, plus dealership labor rates, can push the total toward $300–$600 or more. The most important factors are engine accessibility, plug choice, and labor rates. Always verify the recommended plug type and torque specs in your owner’s manual or service guide, and consider professional service if the engine layout looks complex.
