A Guide to Replacing Spark Plugs on Your 2008-2021 Lexus LX570
Keep your LX570's V8 running smoothly with the right spark plugs and knowledge.
- Stick with OEM-equivalent brands like Denso or NGK for the best performance and longevity.
- Replacement is recommended around 100,000-120,000 miles, but symptoms can appear sooner.
- This is a difficult DIY job due to poor access to the rear cylinders; professional installation is often worth the cost.
- A flashing check engine light indicates a severe misfire that could damage your catalytic converters; address it immediately.
Symptoms of Failing Spark Plugs
Worn-out spark plugs can cause noticeable problems with your LX570. If you experience any of these signs, it may be time for a replacement.
- Rough Idle: Your engine may shake or vibrate more than usual when you're stopped.
- Poor Acceleration: The vehicle may feel sluggish or slow to respond when you press the gas pedal.
- Reduced Fuel Economy: You might find yourself visiting the gas station more often because worn plugs can lead to incomplete fuel combustion.
- Difficulty Starting: A weak spark can make it harder for the engine to turn over, especially in cold weather.
- Check Engine Light: A misfiring cylinder caused by a bad spark plug will often trigger the check engine light with codes like P0300 through P0308. 🎬 Watch this video to diagnose a specific cylinder misfire.
Choosing the Right Aftermarket Spark Plugs
For a precision-engineered vehicle like the LX570, the brand of spark plug matters. While many brands are available, owner experiences and mechanic recommendations point to a clear hierarchy.
OEM vs. Aftermarket Quality
Lexus uses Denso and NGK as original equipment (OEM) suppliers for their spark plugs. This means that buying Denso or NGK iridium plugs from an aftermarket retailer is essentially getting an OEM-quality part. These brands are designed specifically for the performance and longevity requirements of your engine. While brands like Autolite, Bosch, and Champion are available and may be cheaper, they are not the factory choice and may not offer the same 100,000+ mile lifespan or performance consistency that LX570 owners expect.
Brand Tiers for Lexus LX570
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Tier 1 (OEM Equivalent): Denso & NGK
These are the trusted choices. Both Denso and NGK supply iridium spark plugs to Toyota and Lexus. They offer long life (often up to 100,000-120,000 miles), stable performance, and are engineered to the exact specifications of your 3UR-FE engine. You can't go wrong choosing either brand. -
Tier 2 (Reputable Aftermarket): Bosch, Champion, Autolite
These brands produce quality spark plugs, including iridium and platinum models that fit the LX570. However, they are not the OEM supplier and are generally considered a budget-friendly alternative. For a high-performance, long-lasting engine like the one in the LX570, sticking with the OEM-equivalent brands is strongly recommended by owner communities.
Known Issues, Recalls, and TSBs
As of now, there are no specific recalls or Technical Service Bulletins (TSBs) from Lexus or the NHTSA regarding spark plugs for the 2008-2021 LX570. Searches for common problems primarily point to the difficulty of the replacement job itself. One thing to watch for during replacement is oil in the spark plug wells. This is not a failure of the plug itself but indicates a potential leak from the valve cover gaskets or spark plug tube seals, which is a more involved repair.
🎬 See how to replace valve cover gaskets and spark plugs.Cost to Replace Spark Plugs on a Lexus LX570
The cost depends on whether you do the job yourself or hire a professional. The V8 engine requires eight spark plugs.
| Expense Item | Estimated Cost |
|---|---|
| Aftermarket Spark Plugs (DIY, 8 plugs) | $32 - $170 |
| OEM Spark Plugs (DIY, 8 plugs) | $96 - $128 |
| Shop Labor Cost | $270 - $400 |
| Total Professional Replacement | $390 - $550+ |
Frequently Asked Questions (FAQ)
How often should I replace the spark plugs on my LX570?
The recommended replacement interval for the factory-installed iridium spark plugs is typically every 100,000 to 120,000 miles. However, it's a good idea to inspect them around the 90,000-mile mark, especially if you do a lot of short-trip driving.
Is replacing the spark plugs a DIY job?
It can be, but it's considered difficult. While the front plugs are easy to access, the rear plugs (especially cylinders #7 and #8 on the driver's and passenger's side rear) are very tight. The job often requires removing the air filter box and disconnecting heater hoses, which means you'll also need to top off your engine coolant. If you're not an experienced DIY mechanic, it might be best to leave this job to a professional.
🎬 Watch a walkthrough of the removal process and required tools.Do I need to gap the new spark plugs?
Generally, no. High-quality iridium spark plugs from Denso and NGK come pre-gapped from the factory for your vehicle. It's a good practice to verify the gap with a feeler gauge, but you should be very careful not to damage the fragile iridium tip. Do not use a coin-style gapping tool.
What is the OEM spark plug for the LX570?
The original equipment spark plugs are made by Denso or NGK. A common OEM part number is Lexus 90919-01191, which often corresponds to the Denso SK20HR11. Always confirm the exact part number for your specific model year before purchasing.
Helpful Videos
Technical Specifications
OEM Part Numbers: 90919-01191 90919-A1002
Engine: 5.7L V8 (3UR-FE) Quantity Required: 8 Recommended Type: Iridium OEM Brands: Denso, NGK Common OEM Plug: Denso SK20HR11 Preset Gap: ~0.044 inches
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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.
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