On a 2019 Highlander, a full spark plug replacement typically costs about $200 to $500 in the United States, with prices varying by engine (four-cylinder vs. V6) and plug type. DIY repairs can cut labor costs, while premium plugs and dealer services tend to push the total higher.
The Highlander comes with two engine options for 2019: a 2.7-liter four-cylinder and a 3.5-liter V6. The four-cylinder has four spark plugs; the V6 has six. Spark plug type (iridium, platinum, or copper) affects price and longevity, and labor time grows with more cylinders and tighter engine access. Regional labor rates and shop policies also influence the final bill.
Engine options and plug types
Knowing which engine your Highlander has and the type of spark plugs fitted helps explain the cost differences you’ll see at the shop.
- 2.7L inline-four engine (four spark plugs): fewer plugs and generally shorter maintenance time.
- 3.5L V6 engine (six spark plugs): more plugs to replace, typically requiring more labor and time.
- Spark plug types vary: iridium or long-life platinum plugs are common in modern Toyotas; copper plugs are cheaper upfront but may wear sooner.
- In some cases, ignition coils or boots may need inspection or replacement if they show wear or misfire symptoms during the job.
Understanding the engine and plug type helps explain why the price range differs between a four-cylinder and a V6 Highlander, and why premium plugs can tilt the total upward.
Cost breakdown: parts vs. labor
Prices divide into what you pay for the parts themselves and what you pay for labor. Here is a typical breakdown to set expectations.
- Parts costs (per-plug price varies by type):
- Four-cylinder (4 plugs): roughly $32–$80 total for the plugs.
- V6 (6 plugs): roughly $48–$120 total for the plugs.
- Labor costs (time and rate):
- Four-cylinder: about 0.8–1.5 hours of labor at $100–$150 per hour, roughly $80–$225.
- V6: about 1.5–2.5 hours of labor at $100–$150 per hour, roughly $150–$375.
- Additional costs:
- Possible diagnostic fees if misfires are present.
- Replacement of worn coil boots or ignition coils, if needed.
- Tire/vehicle disposal fees or shop supply charges may apply at some shops.
These figures reflect common pricing patterns and can vary by region, dealership vs. independent shop, and the exact plug type chosen.
Typical price ranges by engine
To help compare, here are the common total-cost ranges you might see depending on engine configuration.
- Four-cylinder Highlander (2.7L) — typically about $110 to $310 total, depending on plug type and local labor rates.
- V6 Highlander (3.5L) — typically about $200 to $500 total, with higher end when using premium plugs or if coils/boots are replaced.
Keep in mind that dealer service centers may price higher, and promotions or flat-rate quotes can alter the final number. Always request a written estimate that itemizes parts and labor before authorizing the work.
DIY vs professional service
Deciding whether to tackle spark plug replacement yourself or hire a pro hinges on tools, space, and confidence, especially for the V6 engine where access is tighter and labor time is longer.
- Pros of DIY:
- Potentially lower total cost by saving labor charges.
- Direct control over choosing plugs and timing of the job.
- Cons of DIY:
- Risk of cross-threading or damaging ignition coils/boots if not careful.
- Special tools and procedure specifics; longer time if you’re not experienced.
- When to hire a pro:
- If you don’t have the right tools or a clean workspace.
- If you’re dealing with the V6’s tighter access and possible coil-related work.
- If you want a warranty-backed job or a pre-purchase inspection
Regardless of the path you choose, ensure the service includes a quick inspection of ignition coils and boots, and a spark plug torque check to avoid future issues.
Summary
For a 2019 Toyota Highlander, plan for a total spark plug replacement in the ballpark of $110–$500 depending on engine type, plug selection, and labor rates. The four-cylinder model sits on the lower end of the range, while the six-cylinder version tends to be higher due to the extra plugs and longer labor time. Get a written estimate that separates parts and labor, and consider whether premium plugs or a DIY approach best fits your situation. Regular maintenance aligned with the vehicle’s manual helps ensure optimal performance and longevity.
Additional note
Always verify the current maintenance schedule in your owner's manual and consult your preferred shop for an exact price, as regional pricing and promotions can significantly affect the final bill.
How often should I change the spark plugs on my 2019 Toyota Highlander?
Every 72 months/60,000 miles:
If your Highlander is equipped with the 3.5L V6 engine, you'll need to replace the spark plugs at the 72-month or 60,000-mile mark. This interval is also a good time to start inspecting the drive belts for signs of wear.
What are the common 2019 Highlander issues?
Owner Reported Trouble Spots
- Exhaust. Muffler, pipes, catalytic converter, exhaust manifold, heat shields, leaks.
- In-car Electronics.
- Climate System.
- Body Hardware.
- Brakes.
- Suspension/Steering.
- Paint/Trim.
- Transmission Minor.
What kills spark plugs quickly?
Pre-ignition can lead to heat building up in the combustion chamber causing the spark plugs to fail. In addition, if the cooling system isn't functioning correctly, it can cause the engine and spark plugs to overheat. This overheating can lead to the spark plug's electrode wearing out faster.
How much to replace spark plugs on a 2019 Toyota Highlander?
between $511 and $794
The average cost for a Toyota Highlander Spark Plug Replacement is between $511 and $794. Labor costs are estimated between $460 and $675 while parts are priced between $51 and $118. This range does not include taxes and fees, and does not factor in your unique location. Related repairs may also be needed.