How to disconnect, remove, and replace the Coolant Temperature Sensor on the Lexus RX350?

Be careful with the ECT sensor in four-cylinder models as it affects the fuel injection system. It's on the left end of the cylinder head. Disconnect the negative battery cable, partially drain the cooling system, disconnect the sensor's electrical connector, and unscrew it. Apply Teflon tape to the threads and ensure secure tightening during installation. In V6 models, the ECT sensor is on the water outlet casting on 3.0L and 3.3L engines, and under the air filter housing on 3.5L engines. Disconnect the negative battery cable, partially drain the cooling system, and disconnect the sensor's electrical connector. Depending on the model, unscrew the sensor or remove the retaining clip and pull out the sensor. Ensure proper tightening or full seating before reinserting the clip. Refill the cooling system to finish.

Genuine Lexus RX350 Coolant Temperature Sensor

Coolant Water Temperature Sensor

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7 Coolant Temperature Sensors found

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Lexus RX350 Sensor, Water Temperature (For E.F.I.)
Part Number: 89422-33030
$72.43 MSRP: $97.95
You Save: $25.52 (27%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Coolant Temperature Sensor, Temperature Sensor
- Manufacturer Note: (J)
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 2023-2025 Lexus RX350 | 4 Cyl 2.4L | T24AFTS; TALA10L-AWZGTA, TALA10L-CWZGTA, TALA15L-CWZGTA, TALH17L-AWTGTA, TALH17L-CWTGTA
- 2007-2015 Lexus RX350 | STD | 6 Cyl 3.5L | 2GRFE, 2GRFXE; GGL10L-AWTGKA, GGL10L-CWTGKA, GGL15L-AWTGKA, GGL15L-CWTGKA, GGL15L-CWZGKA, GSU30L-AWAGKA, GSU30L-CWAGKA, GSU35L-AWAGKA, GSU35L-CWAGKA, GYL10L-AWXGKA, GYL10L-CWXGKA, GYL15L-AWXGKA, GYL15L-CWXGKA
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Lexus RX350 Sensor, Water Temperature (For E.F.I.)
Part Number: 89422-35010
$72.43 MSRP: $97.95
You Save: $25.52 (27%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Coolant Temperature Sensor
- Manufacturer Note: P/N LABEL=8942235010
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 2007 Lexus RX350 | STD | 6 Cyl 3.3L | 3MZFE; MCU33L-AWAGKA, MCU33L-CWAGKA, MCU38L-AWAGKA, MCU38L-CWAGKA
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Lexus RX350 Sensor, Water Temper
Part Number: 89422-47010
$70.71 MSRP: $95.62
You Save: $24.91 (27%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Sensor, Water Temperature (For E.F.I.); Coolant Temperature Sensor, Temperature Sensor
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 2016-2022 Lexus RX350 | STD | 6 Cyl 3.5L | 2GRFKS, 2GRFXS; GGL20L-CWZGBA, GGL25L-AWZGBA, GGL25L-BWZGBA, GGL25L-CWZGBA, GYL20L-CWXGBA, GYL25L-AWXGBA, GYL25L-CWXGBA
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Lexus RX350 Sensor, Water Temperature (For E.F.I.)
Part Number: 89422-06010
$68.13 MSRP: $92.13
You Save: $24.00 (27%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Coolant Temperature Sensor, Temperature Sensor
- Manufacturer Note: (L)
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 2007 Lexus RX350 | STD | 6 Cyl 3.5L | 2GRFE; GSU30L-CWAGKA, GSU35L-CWAGKA
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Lexus RX350 Sensor, Temperature
Part Number: 89429-12010
$113.27 MSRP: $153.18
You Save: $39.91 (27%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Oil Temperature Sending Unit
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 2023-2025 Lexus RX350 | 4 Cyl 2.4L | T24AFTS; TALA10L-AWZGTA, TALA10L-CWZGTA, TALA15L-CWZGTA, TALH17L-AWTGTA, TALH17L-CWTGTA
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Lexus RX350 Sensor, Water Temper
Part Number: 89422-33040
$69.97 MSRP: $94.63
You Save: $24.66 (27%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 2023-2025 Lexus RX350 | 4 Cyl 2.4L, 4 Cyl 2.5L | A25AFXS, T24AFTS; AALH15L-AWXGBA, AALH15L-CWXGBA, AALH16L-AWXGBA, TALA10L-AWZGTA, TALA10L-CWZGTA, TALA15L-CWZGTA, TALH17L-AWTGTA, TALH17L-CWTGTA
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Lexus RX350 Switch, Temperature
Part Number: 89428-12170
$128.52 MSRP: $173.81
You Save: $45.29 (27%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 2010-2015 Lexus RX350 | STD | 6 Cyl 3.5L | 2GRFXE; GYL10L-AWXGKA, GYL10L-CWXGKA, GYL15L-AWXGKA, GYL15L-CWXGKA

Lexus RX350 Coolant Temperature Sensor

The Lexus RX350 Coolant Temperature Sensor is constantly monitoring the coolant temperature to allow the engine computer to ensure the SUV remains running smoothly and safely. Threaded directly into a coolant passage, in the current RX350 generation, this Coolant Temperature Sensor exposes its NTC thermistor tip to flowing antifreeze. The resistance drops as temperature climbs, and the ECM reads the changing return voltage against its steady five-volt reference to decide fuel pulse width, spark timing, idle speed, and fan activation. Earlier models of Lexus only required the on or off signal and made use of a coolant switch; however, all of the recent crossovers are equipped with the variable output Coolant Temperature Sensor since the vehicle uses a complete temperature mapping process instead of a trigger. Data from the Coolant Temperature Sensor comes to the ECM immediately, allowing the RX350 to enrich mixtures for cold starts, to increase idle to avoid stalling, followed by leaning out as heat is generated, and also to delay such systems as EGR or torque converter lockup until it's safe to do so. Reliable signals from the Coolant Temperature Sensor prevent overheating, wasted fuel, and emissions issues to make it one of the many critical small parts on any Lexus RX350 within the Lexus cooling system.

Should you need to purchase new auto parts for your vehicle, we strongly suggest you consider the genuine Lexus RX350 Coolant Temperature Sensor available on LexusPartsNow.com. Our OEM Lexus RX350 Coolant Temperature Sensor come with the reassurance of the manufacturer's warranty, a hassle-free return policy, and speedy delivery service, all at affordable prices online. Feel free to shop with confidence!

Lexus RX350 Coolant Temperature Sensor Parts Questions & Experts Answers

Sensor, Water Temperature (For E.F.I.)
89422-33030
Q: How to disconnect, remove, and replace the Coolant Temperature Sensor on the Lexus RX350?
A:
Be careful with the ECT sensor in four-cylinder models as it affects the fuel injection system. It's on the left end of the cylinder head. Disconnect the negative battery cable, partially drain the cooling system, disconnect the sensor's electrical connector, and unscrew it. Apply Teflon tape to the threads and ensure secure tightening during installation. In V6 models, the ECT sensor is on the water outlet casting on 3.0L and 3.3L engines, and under the air filter housing on 3.5L engines. Disconnect the negative battery cable, partially drain the cooling system, and disconnect the sensor's electrical connector. Depending on the model, unscrew the sensor or remove the retaining clip and pull out the sensor. Ensure proper tightening or full seating before reinserting the clip. Refill the cooling system to finish.