A Guide to Spark Plugs for the 2018-2022 Lexus RX350L
Everything you need to know about choosing the right spark plugs and when to replace them on your V6 engine.
- Replace your spark plugs every 60,000 miles as recommended by Lexus to maintain performance and warranty.
- Stick to high-quality Iridium spark plugs from OEM brands Denso or NGK for the best results.
- This is a difficult replacement job due to the need to remove the intake manifold for the rear plugs; professional installation is recommended for most owners.
- Symptoms like a rough idle, poor acceleration, and a check engine light with P030x codes are strong signs of worn spark plugs.
When to Replace Your Spark Plugs
For the 2018-2022 Lexus RX350L, the manufacturer's recommended replacement interval for spark plugs is every 60,000 miles or 6 years, whichever comes first. This is a required service to maintain your vehicle's Emission Control Warranty. While the factory-installed Iridium plugs are durable, waiting too long to change them can lead to poor engine performance and potentially damage more expensive parts like ignition coils.
Symptoms of Worn Spark Plugs
If your RX350L is approaching or has passed the 60,000-mile mark, you might notice some of these common symptoms of failing spark plugs:
- Rough Idle: The engine may shake or vibrate more than usual when stopped.
- Poor Acceleration: The vehicle may feel sluggish or hesitant when you press the gas pedal.
- Reduced Fuel Economy: You may find yourself filling up the gas tank more often.
- Engine Misfires: The engine may stumble or hesitate, sometimes causing a flashing Check Engine Light.
- Difficulty Starting: The engine may take longer to turn over than normal.
- Check Engine Light: A solid or flashing Check Engine Light, often with codes like P0300 (random misfire) or P0301-P0306 (cylinder-specific misfires), is a strong indicator.
A Note on Recalls
There are no known recalls or technical service bulletins (TSBs) for spark plugs on the 2018-2022 RX350L. However, there are several major recalls for a faulty fuel pump that can cause similar symptoms, such as engine stalling. If you experience sudden engine issues, it is wise to have a dealer check for open recalls on your vehicle.
Choosing the Right Aftermarket Spark Plugs
When shopping for spark plugs for your RX350L, quality matters. The original equipment (OEM) plugs are made by Denso and are Iridium-tipped for long life and performance.
Tier 1: OEM-Equivalent (Recommended)
- Denso: As the original manufacturer, choosing Denso Iridium plugs (like the Iridium Long Life or Iridium TT) is the safest bet. They are engineered specifically for your engine. The specific OEM part is the Denso FK20HBR8.
- NGK: NGK is another top-tier Japanese brand and an OEM supplier for many vehicles, including Toyota and Lexus. Their Laser Iridium or Ruthenium plugs are excellent alternatives and are trusted by many mechanics.
Tier 2: Reputable Aftermarket
- Autolite: Brands like Autolite offer Iridium plugs (such as their Iridium XP or Ultra series) that meet OE specifications. They can be a good value, but most Lexus specialists and owners stick with Denso or NGK for guaranteed compatibility and performance.
Tier 3: Budget Brands
- Champion: While Champion offers basic copper plugs at a very low price, these are not appropriate for your RX350L. Using a non-Iridium plug will result in poor performance and a very short service life. You should only consider their Iridium offerings if premium brands are not available.
Pro Tip: Stick with Iridium
Your RX350L's 2GR-FKS engine was designed for Iridium spark plugs. Do not downgrade to platinum or copper plugs to save a few dollars. The difficult and expensive labor for this job means you want to install the best, longest-lasting part possible. Always buy from a reputable source to avoid counterfeit plugs, which are common online.
Cost to Replace Spark Plugs
The cost of replacing spark plugs on the RX350L is higher than on many other vehicles, primarily due to labor. The rear three plugs are located under the intake manifold, which must be removed for access.
| Item | Estimated Cost |
|---|---|
| New OEM Spark Plugs (6) | $90 - $120 |
| New Aftermarket (Denso/NGK) Plugs (6) | $60 - $110 |
| Shop Labor | $280 - $600+ |
| Total Professional Installation | $400 - $700+ |
Frequently Asked Questions
Is replacing the spark plugs a DIY job?
This is a difficult DIY job. While the front three plugs are easy, the rear three require removing the intake manifold, various hoses, and sensors. It requires special tools, including a torque wrench, and several hours of work. For most owners, this job is best left to a professional mechanic.
Do I need to gap the new spark plugs?
No. High-quality Iridium spark plugs from Denso or NGK come pre-gapped from the factory. Attempting to adjust the gap on these fine-wire plugs can easily damage the delicate Iridium tip.
What is the OEM spark plug for my RX350L?
The OEM part number is Lexus/Toyota 90919-01263. This corresponds to the Denso Iridium Long Life plug, model FK20HBR8.
Can I wait until 100,000 miles to change them?
No. While some older Lexus models had a 100k or 120k mile interval, the 2GR-FKS engine in the 2018-2022 RX350L has a specific 60,000-mile interval. Extending the interval risks performance loss and potential damage to other ignition components.
Technical Specifications
OEM Part Numbers: 90919-01263
Requires a set of six (6) Iridium type spark plugs. The OEM plug is a Denso FK20HBR8. The job requires a 5/8-inch (16mm) spark plug socket and a torque wrench. The specified torque is 13 ft-lbs (18 Nm).
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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 RX350L: