97 Lexus LX450 P0125 diagnostic code

Tiny
RMUNSCH
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  • LEXUS
I'm working on a '97 Lexus LX450. I just replaced the engine after it failed the head gasket. Now it's showing a diagnostic code of "P0125. Closed loop fuel system. Insufficient coolant temp." I have replaced the thermostat & cancelled the code but after about two or three miles, the check engine light comes back on. Thanks, Ray
Sunday, January 7th, 2007 AT 2:48 PM

3 Replies

Tiny
SERVICE WRITER
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Indicates the ECT or CHT sensor has not achieved the required temperature level to enter closed loop operating conditions within a specified amount of time after starting the engine.

Possible causes:
Insufficient warm up time
Low engine coolant level
Leaking or stuck open thermostat
Malfunctioning ECT sensor
Malfunctioning CHT sensor
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Sunday, January 7th, 2007 AT 7:31 PM
Tiny
SERVICE WRITER
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Ray,
Getting infomation is such a PITA, and conflicting too. At work I checked alldata and according to that it points to your front oxygen sensor. I'm more inclined to go by this than my previous post.

I'm a service writer. What can I tell you?
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Monday, January 8th, 2007 AT 6:14 PM
Tiny
CARUNDELL
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Hey, Yeah one of toyota/lexus shining moments. Code desciption points you in the wrong direction. O2 is the cause, and was damaged by coolant when the head gasket failed.

Chris
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Monday, January 15th, 2007 AT 5:14 AM

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