P0128 Error Code - Club Lexus Forums

P0128 Error Code

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Old 07-30-14, 01:17 PM   #1
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Default P0128 Error Code

Hi Everyone,

I have been getting a P0128 pretty often lately. It doesn't stay on all the time, sometimes it does go away and comes back. This is the only error code I get when I look up the Check Engine Light.

Based on the error code, I assume its either the Thermostat or the Coolant Temp Switches.

With the car cool, I remove the radiator cap and start the car. The coolant does not flow. I just slow rises after a while. Based on this, I assume the Thermostat is not stuck wide open.

I'm going to test the 2 Coolant Temp Switches. I know the #1 CTS is located at the bottom of the radiator. Can anyone show me a picture of where the #2 CTS is located?

Anyone have an idea what might cause this error code?
Any other troubleshooting ideas?

Thank you.
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Old 07-30-14, 04:08 PM   #2
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Please post the behavior of temp gauge.

If the thermostat is stuck open, then it would take abnormally long time to get to the middle of the gauge.

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