viclykewhoa Posted March 6, 2006 Share Posted March 6, 2006 The diagnostic code P0125 popped up on my '99 GS300. The code is for: Clsd Loop Fuel Ctrl Insufficient Coolant Temp. From the diagnostic pdf file I read for the GS its either the thermostat or the engine coolant temp sensor. I know where the thermostat is but where is the engine coolant temperature sensor? Quote Link to comment Share on other sites More sharing options...
GuyTelefunken Posted March 6, 2006 Share Posted March 6, 2006 Did you fix your oxygen sensor yet (you mentioned it in a previous post)? A failed O2 sensor can cause this code. Quote Link to comment Share on other sites More sharing options...
mehullica Posted March 6, 2006 Share Posted March 6, 2006 Coolant temp sensor is drivers side, on the head, behind the area where the dipstick tube bolts on. 2 wire connector. Quote Link to comment Share on other sites More sharing options...
viclykewhoa Posted March 9, 2006 Author Share Posted March 9, 2006 Did you fix your oxygen sensor yet (you mentioned it in a previous post)? A failed O2 sensor can cause this code. yeps... i've had the o2 senesors changed. thanks for remembering.... haha. Quote Link to comment Share on other sites More sharing options...
viclykewhoa Posted March 15, 2006 Author Share Posted March 15, 2006 Did you fix your oxygen sensor yet (you mentioned it in a previous post)? A failed O2 sensor can cause this code. hey guytelefunken, how would a bad o2 sensor cause the P0125 code to pop up. how is the o2 sensor related to engine coolant temp? i was just wondering. let me know. thanks for all your help. Quote Link to comment Share on other sites More sharing options...
GuyTelefunken Posted March 15, 2006 Share Posted March 15, 2006 Well, here is what Lexus has to say about P0125. P0125.pdf Quote Link to comment Share on other sites More sharing options...
Buff Posted August 7, 2010 Share Posted August 7, 2010 I have a 2000 GS300, is the coolant temp sensor located in the same place as the 99. I'm having a hell of a time finding it. You wouldn't happen to have any pictures, would you? Quote Link to comment Share on other sites More sharing options...
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