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Engine Coolant Temperature High then back to normal

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Old Dec 20, 2017 | 11:37 AM
  #1  
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Default Engine Coolant Temperature High then back to normal

Hello all,
this is my first post in club Lexus and I am hoping I found the correct place for my question to be answered.

I drive a 2016 is200t.
Just hit 20k miles.

Recently I started getting a message that my engine coolant temperature is high. Obviously it wasn't a joking matter and I started looking what it could be.

From my observations the message only stays on the screen for about 3-5 seconds and then the gauge shows that the temperature is back to normal.

I have a feeling that engine coolant sensor sensor is tweaking because there is no way engine coolants temperature can cool down that much in 5 seconds.

My question in, does anyone know what could be the issue or my observations are correct?
Also I am having difficult times locating the sensor.

I will pleased to hear anything on this matter.
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Old Dec 20, 2017 | 11:40 AM
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Personally, I wouldn't even bother trying to diagnose and I'd just make a service appointment, assuming you're still under warranty.
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Old Feb 12, 2019 | 09:58 PM
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Default Coolant temperature high then back to normal.

did you ever figure out why the coolant temperature was going high for a few seconds then going back to normal? My 2016 is 200t is doing the same thing. Except I have 65000 miles now.
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Old Feb 12, 2019 | 10:33 PM
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Yes lol
As stupid as it sounds I just had to add coolant

Bought mine from AutoZone, I believe it was a pink color.
Check how much there is in both of your reservoirs.

Should be a very easy fix.
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Old Feb 25, 2022 | 12:37 PM
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Did you find out the problem? I have a same car and problem as your, but my is 30k miles. thanks.
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Old Mar 19, 2022 | 09:11 AM
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Just wanna ask as I am going to change my coolant soon, is our 3IS coolant system "self-burping"? Thanks..
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