Lexus LX570 (2008-2012) Engine Coolant Temperature Sensor Replacement Guide
Learn to spot the symptoms of a failing temperature sensor and choose the right replacement for your LX570.
- A failing ECT sensor will most likely trigger a Check Engine Light and cause poor fuel economy or rough running.
- For best results and reliability, choose an OEM-quality brand like Denso, which is the original supplier for Lexus.
- This is a simple DIY replacement that can save you hundreds of dollars in labor costs.
- There are no active recalls for this specific part on the 2008-2012 LX570; failures are from normal aging.
Is your Lexus LX570's Engine Temperature Sensor Failing?
A faulty Engine Coolant Temperature (ECT) sensor can cause noticeable problems in your LX570. Because this small sensor provides key data for engine management, a bad signal can throw everything off. Ignoring the signs can lead to poor performance, bad fuel mileage, and potentially more serious engine issues.
Key Failure Symptoms
- Check Engine Light: This is often the first warning. The ECU will detect an illogical signal from the sensor and trigger a light on your dash. Common trouble codes include P0115, P0117, P0118, and P0128.
- Worse Fuel Economy: If the sensor incorrectly tells the computer the engine is always cold, the system will inject extra fuel. This leads to more trips to the gas station.
- Black Smoke from Exhaust: A side effect of the engine running too rich is unburnt fuel exiting through the exhaust, which creates black smoke.
- Engine Overheating: A sensor that fails to report that the engine is hot can prevent the cooling fans from turning on, causing the engine to overheat.
- Rough Idle or Hesitation: With incorrect temperature data, the engine's timing and fuel mixture can be off, leading to a shaky idle or poor acceleration.
No Known Recalls or Bulletins
As of early 2026, there are no specific recalls or Technical Service Bulletins (TSBs) from Lexus or the NHTSA for the engine coolant temperature sensor on the 2008-2012 LX570. Failures are typically due to normal wear and tear.
Choosing the Right Aftermarket Sensor
For a critical component like an ECT sensor, quality matters. While you can save money with an aftermarket part, it's important to choose a reputable brand to avoid replacing it again soon. Lexus uses high-quality components, and the engine management system is sensitive to incorrect readings.
Brand Quality Tiers
Not all aftermarket brands are created equal. Here’s a breakdown of the brands available for your LX570:
- OEM-Quality (Top Tier): Denso is the original equipment manufacturer for many Toyota and Lexus parts, making it the safest bet for a perfect fit and performance. Delphi is another top-tier OE supplier with a strong reputation for quality sensors. NGK is also a highly respected brand in the sensor and ignition world.
- Reputable Aftermarket (Mid Tier): Brands like Standard Ignition (SMP), Beck Arnley, and Motorad produce reliable parts that meet or exceed OEM specifications and are a good balance of price and quality.
- Budget-Friendly (Economy Tier): Brands like URO Parts are typically the most affordable. However, forum discussions often point to lower quality and a higher failure rate for their electronic components. Consider these only if budget is the primary concern and you are aware of the potential risk.
Pro Tip: Stick with What Works
For a luxury vehicle like the LX570, it is strongly recommended to use an OEM-quality brand like Denso. The price difference is often minimal, but the reliability and accuracy ensure your engine performs as it was designed to.
Cost to Replace the LX570 Coolant Temperature Sensor
Replacing the ECT sensor is a relatively inexpensive job, especially if you do it yourself. The part itself is affordable, but professional labor can add a significant amount to the total cost.
| Item | Estimated Cost |
|---|---|
| New Aftermarket Part | $13 - $83 |
| New OEM Part | $70 - $100 |
| Shop Labor | $220 - $322 |
| Total Professional Replacement (OEM Part) | $290 - $422 |
| Total DIY Replacement (Aftermarket Part) | $13 - $83 |
Frequently Asked Questions
Where is the coolant temperature sensor located on a 2008-2012 Lexus LX570?
The ECT sensor is typically found threaded into the engine block or cylinder head near the thermostat housing, which is where the main upper radiator hose connects to the engine. It will have an electrical connector attached to it.
Can I replace the LX570 ECT sensor myself?
Yes, this is a DIY-friendly job for those with basic tools. The process involves letting the engine cool completely, disconnecting the electrical connector, and using a deep socket wrench to unscrew the old sensor. Be prepared for a small amount of coolant to spill and have a rag and drain pan ready.
Do I need to drain the coolant to replace the sensor?
A full drain is usually not necessary. Since the sensor is located high on the engine, only a small amount of coolant will be lost when you remove it. You can simply top off the coolant level in the reservoir after installing the new sensor.
Should I buy an OEM or Aftermarket sensor?
For this part, an OEM brand like Denso is highly recommended. The engine computer relies on accurate readings for performance and fuel economy. While brands like Standard or Delphi are also reliable, the small cost savings of a budget part is often not worth the risk of poor performance or premature failure.
Technical Specifications
OEM Part Numbers: 89422-33030 89422-47010
Typically a 2-pin thermistor sensor that threads into a coolant passage on the engine.
We Have This Part in Stock
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 LX570:
- 🛍️ Shop This Part
- Is your Lexus LX570's Engine Temperature Sensor Failing?
- Key Failure Symptoms
- No Known Recalls or Bulletins
- Choosing the Right Aftermarket Sensor
- Brand Quality Tiers
- Pro Tip: Stick with What Works
- Cost to Replace the LX570 Coolant Temperature Sensor
- Frequently Asked Questions
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