A Guide to Spark Plug Replacement for the 2018-2024 Lexus ES250
Keep your ES250's 2.5L engine running perfectly by understanding when and how to replace your spark plugs.
- Stick with OEM-equivalent iridium spark plugs from NGK or Denso for the best performance and longevity.
- Replace spark plugs as a complete set of four to ensure balanced engine performance.
- A flashing check engine light indicates a severe misfire; avoid driving to prevent expensive catalytic converter damage.
- While the official maintenance schedule may say 60,000 miles, iridium plugs often last 100,000 miles or more under normal conditions.
Symptoms of Failing Spark Plugs
When spark plugs wear out, they can cause noticeable problems with your ES250's performance. You might feel a hesitation or jerking when you accelerate, or the engine may idle roughly, causing vibrations while you're stopped. Other common signs include a decrease in fuel economy, difficulty starting the engine, and the check engine light coming on. If the check engine light is flashing, it signals a serious engine misfire that should be addressed immediately to avoid damage to other components like the catalytic converter.
🎬 See a visual guide to common bad spark plug symptomsCheck Engine Light Codes
Worn spark plugs are a primary cause of engine misfires. This will trigger the check engine light and store diagnostic trouble codes. Common codes for misfires include P0300 (random misfire) and P0301, P0302, P0303, or P0304, which point to a misfire in a specific cylinder.
🎬 Learn how to diagnose and fix a P0300 misfire codeChoosing the Right Aftermarket Spark Plugs
The 2018-2024 Lexus ES250 came from the factory with high-quality long-life iridium spark plugs, typically made by Denso or NGK. When choosing aftermarket replacements, it's best to stick with these OEM-equivalent brands to ensure compatibility and performance.
Brand Tiers for Your Lexus
- Tier 1 (OEM Equivalent): NGK & Denso. These brands are the original equipment suppliers for Toyota and Lexus. Choosing an NGK Laser Iridium or Denso Iridium Long Life plug is the safest bet for maintaining factory performance and longevity. These are considered the best choice for any Japanese vehicle.
- Tier 2 (High-Quality Aftermarket): Bosch. Bosch offers high-quality iridium and double platinum plugs that are a reliable alternative. While often associated with European cars, their premium lines perform well in many vehicles.
- Tier 3 (Standard/Budget): Autolite & Champion. These brands provide functional and affordable options, often in platinum or copper. However, they generally do not have the same lifespan or performance consistency as iridium plugs from NGK or Denso in Japanese engines. If you choose these, plan on a shorter replacement interval.
A Note on Counterfeits
Be cautious when purchasing spark plugs, especially from online marketplaces. Counterfeit NGK and Denso plugs are common and can lead to poor performance and engine problems. It is always best to buy from reputable, authorized auto parts retailers.
Cost to Replace Lexus ES250 Spark Plugs
| Category | Estimated Cost |
|---|---|
| DIY Parts (Aftermarket) | $45 - $115 (for a set of 4) | 🎬 Watch: Step-by-step spark plug replacement for this engine
| Shop Parts & Labor | $194 - $263 |
Frequently Asked Questions
When should I replace the spark plugs on my 2018-2024 ES250?
While some maintenance guides suggest a 60,000-mile interval for emissions warranty purposes, modern Lexus models with iridium spark plugs typically have a recommended replacement interval of around 100,000 to 120,000 miles. Always consult your owner's manual for the specific schedule for your vehicle.
What type of spark plug is best for the ES250?
Iridium spark plugs are the best choice, as they were the original equipment. They offer the best performance, fuel efficiency, and longest service life compared to platinum or copper plugs.
Do I need to gap the new spark plugs?
Most high-quality iridium spark plugs from brands like NGK and Denso come pre-gapped from the factory for your specific vehicle. It is not recommended to adjust the gap yourself, as the fine iridium tip can be easily damaged. Always confirm you are buying the correct part number for your ES250.
Are there any recalls for the ES250 spark plugs?
No. Searches of the National Highway Traffic Safety Administration (NHTSA) database show no recalls or technical service bulletins (TSBs) specifically related to spark plug failure for the 2018-2024 Lexus ES250. There have been recalls for other issues, such as airbag sensors and rearview cameras.
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Technical Specifications
OEM Part Numbers: 90919-01289
The 2018-2024 Lexus ES250 uses the A25A-FKS 2.5L 4-cylinder engine. The recommended spark plug is a long-life iridium type. The OEM part number is 90919-01289, which corresponds to Denso or NGK iridium plugs. For example, the NGK DILKAR8P8SY is a compatible aftermarket option.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Lexus ES250: