RX - 2nd Gen (2004-2009) Discussion topics related to the 2004 -2009 RX330, RX350 and RX400H models

Check Engine Light, VSC and No Track

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Old 12-28-17, 08:57 AM
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AlDavison
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Default Check Engine Light, VSC and No Track

Sometimes all 3 lights (Check Engine Light, VSC and No Track ) go-on and there are days when they stay off. Yesterday they were on, but today all lights are off: very weird. Is this something to worry about? The part store says that a code is showing-up on their code reader (P0128).

Any advise?
-Al
Old 12-28-17, 09:52 PM
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JoeInHNL
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I had P0128 (Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) about a year ago. Replacing the thermostat fixed it.

My guess is that you get the fault on cooler days when the engine is not able to get up to temperature due to a stuck open thermostat. I first received the fault driving on the highway on a cold (for Honolulu) morning.
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Old 12-29-17, 12:00 PM
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AlDavison
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Originally Posted by JoeInHNL
I had P0128 (Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) about a year ago. Replacing the thermostat fixed it.

My guess is that you get the fault on cooler days when the engine is not able to get up to temperature due to a stuck open thermostat. I first received the fault driving on the highway on a cold (for Honolulu) morning.
I replaced the thermostat and the problem is now solved!
Thank you!
-Al
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