How much does it cost to replace spark plugs in a Lexus IS 350?
In the United States, replacing all six spark plugs on a Lexus IS 350 typically costs about $350 to $700 at an independent shop, with dealer pricing often higher. Regional differences, parts choices, and whether ignition coils or other components are replaced can push the total higher.
The IS 350 uses a 3.5-liter V6 engine with six spark plugs arranged in a coil-on-plug setup. Access to the plugs is moderately involved, and labor time is a major factor in the final price. Plugs themselves can be sourced as OEM iridium units or aftermarket alternatives, which also affects cost. The following sections break down the main cost drivers and what you might expect to pay.
What affects the price
Key cost drivers
Prices are influenced by the cost of parts, the labor rate at your shop, and whether a dealer or independent shop performs the service. The complexity of access and any preventive diagnostics add to the total. Here are the main factors you should expect to consider:
- Parts cost: six spark plugs; OEM iridium plugs typically cost more than aftermarket options. Expect roughly $6–$12 per aftermarket plug or $12–$30 per OEM plug, for a total parts range of about $36–$180.
- Labor time and rate: for a 3.5L V6 with moderate access, technicians usually bill 1.5–2.5 hours. At shop rates of roughly $90–$150 per hour, labor can be about $135–$375.
- Coil and related components: if coils are worn or codes indicate misfires, some shops replace coils in addition to plugs, which can add $60–$180 per coil (plus extra labor), depending on the vehicle’s condition.
- Dealer vs independent shop: dealerships tend to price higher due to OEM parts and service overhead; independent shops often offer lower rates and may source OEM or aftermarket plugs at a lower total cost.
In practice, most IS 350 owners see a total in the low to mid hundreds for a standard six-plug replacement when no additional parts are needed.
Typical price ranges
What you might expect by shop type
To give a sense of the spread, here are common ranges seen in the U.S. depending on where you go and what is included in the service:
- Independent auto shop: approximately $350–$700 for parts and labor combined.
- Dealership: typically about $600–$900, reflecting higher parts costs and labor rates.
These ranges exclude tax and any state environmental or disposal fees. If the shop recommends replacing ignition coils or other related components, the total can rise accordingly.
What to know before you book
Tips for getting a good price
Ask for a written estimate that separates parts and labor, and confirm whether the price includes old parts disposal and any diagnostic charges. Some shops offer maintenance bundles or price breaks on multiple parts purchases. Getting a few quotes can help you gauge the going rate in your area.
Summary
The cost to replace spark plugs on a Lexus IS 350 is largely driven by labor and parts choices, with typical U.S. prices ranging from about $350 to $900 depending on shop type and region. Independent shops generally offer lower prices than dealerships, and using aftermarket plugs can save money while OEM plugs are often preferred for longevity and performance. If a diagnostic reveals worn ignition coils or other related issues, budget for potential additional parts and labor. Always verify the scope of the service and obtain a detailed estimate before proceeding.
