How much does it cost to replace spark plugs in a Lexus es350?

In short, a professional spark plug replacement for a Lexus ES350 typically costs about $250 to $500, depending on plug type and labor rates. This article explains what drives that price and how to compare quotes from shops.

What affects the price

Costs break down into parts, labor, and any optional services or complications. The following factors are the main drivers behind the final bill.

• Parts cost: six spark plugs, with price varying by material (copper, platinum, iridium) and by whether you choose OEM or aftermarket plugs.


• Labor: time required to access the plugs and replace them; labor rates vary by shop and region.


• Vehicle access and ignition setup: the Lexus ES350 uses a coil-on-plug configuration, so labor can be influenced by how easy it is to reach each plug and whether ignition coils or boots need replacement.


• Additional components: if seals, valve covers, or coils show wear, some shops may suggest replacement, which adds to the cost.


• Shop type and location: dealer service centers tend to be more expensive than independent shops, and metropolitan areas typically have higher labor rates.

Understanding these factors helps in getting accurate quotes and planning for maintenance costs.

Plug types and typical price ranges

Prices depend on plug material and brand. The ES350's 3.5L V6 commonly uses platinum or iridium plugs; copper plugs are less common for this engine but can appear in some aftermarket options. The ranges below assume six plugs and standard installation.

• Copper plugs (6): Parts roughly $12–$30 total; Labor about $60–$120; Estimated total $72–$150.


• Platinum plugs (6): Parts roughly $60–$120; Labor about $60–$120; Estimated total $120–$240.


• Iridium plugs (6): Parts roughly $90–$180; Labor about $60–$120; Estimated total $150–$300.

Note: OEM or branded plugs may cost more, and some shops price by the hour rather than per plug. Always verify what a quote covers, including taxes and disposal fees.

Where you might save money and how to shop around

Smart shopping can trim costs without compromising quality. Consider these approaches when planning the service.

• Get multiple, itemized quotes from independent shops and a dealer to compare parts and labor charges.


• Ask what plug material is recommended for your ES350 and whether the shop uses OEM or aftermarket parts.


• Bundle the service with a routine maintenance visit (e.g., oil change) if possible to negotiate a bundled price.


• Inquire about any current promotions, loyalty programs, or maintenance packages that include spark plug replacement.

These strategies can help you secure a fair price while ensuring you receive quality parts and workmanship.

Do-it-yourself spark plug replacement: is it practical for the ES350?

For a mechanically inclined owner with the right tools, replacing six spark plugs on the ES350 is a doable weekend project. It requires a torque wrench, basic hand tools, and care to avoid damaging coils or ignition boots. Doing it yourself can save labor costs, but incorrect installation, cross-threading, or damaged boots can cause misfires or engine damage. If you’re uncertain about coil-on-plug access or torque specifications, hiring a professional is advisable.

Getting an accurate estimate from shops

To avoid sticker shock, follow these tips when requesting quotes:

• Ask for an itemized estimate that includes parts, labor, tax, and any disposal fees.


• Confirm whether ignition coils, boots, valve cover gaskets, or other components are included or recommended for replacement.


• Clarify if the plugs are OEM or aftermarket and what warranty coverage applies to installed parts.


• Check whether the quote is based on a fixed price per plug or an hourly labor rate, and how many hours are estimated.

Having a clear, written quote helps you compare options and avoid surprise charges after the service is completed.

Summary

Spark plug replacement for a Lexus ES350 typically costs $250–$500 at a shop, with dealer prices often higher. The final price depends on plug material (copper, platinum, or iridium), labor rates, and whether any ancillary work (coils, boots, seals) is recommended or required. By comparing multiple quotes, asking the right questions, and considering DIY parts if you’re comfortable, you can manage costs while keeping the engine running smoothly.

How much does it cost to replace spark plugs in a Lexus ES 350?

The cost to replace the spark plugs in a Lexus ES 350 typically ranges from approximately $550 to over $1,000, depending on the model year, labor costs at different shops, and parts used. A newer model might cost around $550-$790, while a much older model could be closer to $1,000 or more. 
This video shows the process of changing spark plugs on a Lexus ES 350: 1mWet Life SportsYouTube · May 14, 2025
Factors that influence the cost

• Labor: The 2007-2009 ES 350 models have spark plugs in the rear that are difficult to access, requiring more labor time and driving up the cost. Newer models have less labor-intensive spark plug replacement. 
• Parts: The cost of the parts can vary, but expect to pay anywhere from around $100 to over $200 for a set of six plugs. 
• Shop: Dealerships and independent repair shops will have different labor rates. A dealership may charge more for labor than an independent shop. 
• Service: You might be able to get a discount if you combine the service with other maintenance, such as a new air filter or oil change. 

Tips for saving money

• Get multiple quotes from both dealerships and independent mechanics.
• Consider an independent shop that specializes in Lexus or Toyota repairs for potentially lower labor costs. 
• Ask about combining the service with other maintenance to get a bundled discount. 
• If you are comfortable with DIY, you can save money by replacing the parts yourself. 

How much does Lexus charge to change spark plugs?

The cost to replace Lexus spark plugs can range from $400 to over $1,100, with an average around $400 to $700 at an independent shop. A major factor is how accessible the spark plugs are—some Lexus models, like certain IS and ES sedans, have spark plugs buried under components that add significant labor time and cost, potentially pushing the total well over $1,000. 
This video explains how to save money by replacing spark plugs yourself: 1mScrew This!YouTube · Sep 6, 2023
Cost breakdown

• Parts: 6 to 8 spark plugs, which can cost around $10 to $25 each depending on the material (e.g., iridium or platinum), plus any necessary gaskets or other parts. 
• Labor: The price is highly variable, depending on how long it takes to access the plugs. It can be as low as a few hours or several, pushing the cost up significantly for models with more complex engine designs. 
• Dealer vs. independent shop: Dealerships typically charge more, while independent shops can offer more competitive rates. You may find an independent shop willing to do the work for $100-$200 in labor if the spark plugs are easy to access. 
• Other factors: The final price will also depend on your location and the specific parts (like OEM vs. aftermarket) used. If the mechanic recommends replacing other parts, like coils, at the same time, this will also increase the total cost. 

How often should I change the spark plugs on my Lexus ES 350?

The recommended interval for replacing spark plugs in a Lexus ES 350 is every 60,000 miles or 72 months, whichever comes first. This is listed in the official maintenance schedule and is a good rule of thumb for keeping the engine running efficiently and maintaining emissions warranty requirements.
 

• Follow the schedule: The most reliable interval is the one provided by the manufacturer, which is 60,000 miles or 72 months. 
• Consider signs of wear: While the schedule is a guideline, pay attention to performance issues like rough idling, difficulty starting, or a loss of power, as these can indicate that plugs need attention sooner. 
• Check your owner's manual: It's always best to consult your specific vehicle's owner's manual for the most accurate information, as recommendations can vary by model year. 

What year to stay away from Lexus ES 350?

You should avoid the 2007, 2008, 2011, 2013, 2014, and 2015 Lexus ES 350 models due to common issues like melting dashboards, engine/transmission problems, and other mechanical failures. While some later years also have specific reported problems, such as a hollow door design on some 2019 models that causes noise, the 2007-2015 period contains the most widely cited issues.
 
Years to avoid and common problems

• 2007–2009: Prone to oil leaks, engine issues like blown head gaskets, and AC problems from a defective evaporator core. The 2007 model is particularly known for its melting dashboard. Transmission problems like rough shifting and hesitations are also common. 
• 2011: Has a high number of complaints for various problems, including engine and transmission issues, as well as other mechanical failures. 
• 2013–2015: Reportedly have issues with exploding sunroofs, engine stalls when turning, and door lock malfunctions. Some of these years also saw problems with ventilated seats and powertrain fluid leaks. 
• 2019: Some owners reported that the doors feel hollow and let in a lot of road noise, a problem that was reportedly fixed around the 2020-2021 model years. 

Years that are generally considered more reliable

• 2012: Often mentioned as a good year to buy. 
• 2017–2019: Generally considered reliable with modern features. 
• 2020 and later: The years following the 2019 model year are generally considered more reliable, with some specific minor issues such as the hollow doors on 2019 models being addressed in later models.