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Toyota 8FGCU25:
E04-1

I have a Toyota 8FGU25 showing this E 04-1 code & runs terrible at idle. Found & watched a video showing this code - means the engine temperature sensor with 2 wires needs replaced or a wiring issue going to it. I replaced the sensor for $49.00 filled the coolant system & bled it warmed up the engine & still same problem. Next I am going to test the 2 wires going into the plug on this sensor & hoping to find the problem.

• Posted 19 Jan 2024 16:03
• Reply by Darrell_Hawkins
• Indiana, United States

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04-1 Coolant temperature sensor open abnormality.
The engine may have a problem at low temperatures.

• Posted 29 Dec 2015 05:24
• Reply by tomason2
• -, Poland

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