Cant find engine temp sensor 01 gs 300 - 2001 Lexus Gs 300

If your engine is a 2jz-ge it does not have a camshaft sensor, it has a crankshaft sensor
Located on the right side of the engine block

Well code 125 means the engine is not getting hot enough for the emission system to go into closed loop. So you would check the thermostat first. If the engine is reaching normal operating temp of 195 degrees there could be a problem with one of the O2 sensors or the coolant temp sensor.

Get coolant temp sensor checked.

Get the coolant pressure tested, its definitely leaking coolant. You will need to get the coolant running line.

Pressure test will help you to know from where exactly coolant/refrigerant is getting leaked.

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For complete step by step troubleshooting i suggest you to go through the help links mentioned below :----

Click the link below :-----

Coolant enters in transmission on Toyota Land cruiser?

http://schematicsdiagram.blogspot.com/2012/01/coolant-enters-in-transmission-on.html

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1991 Toyota Camry: Order Coolant Bypass Tube?

http://whatisbyme.blogspot.in/2012/05/1991-toyota-camry-order-coolant-bypass.html

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2002 Toyota Camry: Puff of Blue or White Smoke while Starting?

http://whatisbyme.blogspot.in/2012/05/2002-toyota-camry-puff-of-blue-or-white.html

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1994 Toyota Camry: Coolant Leak?

http://technoanswers.blogspot.in/2012/04/1994-toyota-camry-coolant-leak.html

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2006 Cadillac DTS: COOLANT LEAK AT DRIVER SIDE NEAR FIREWALL?

http://schematicsdiagram.blogspot.in/2012/04/2006-cadillac-dts-coolant-leak-at.html

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MAF, IAT, MAP and Coolant Level Sensor problem all together on Mazda MPV?

http://schematicsdiagram.blogspot.com/2011/12/maf-iat-map-and-coolant-level-sensor.html

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GMC Engine Coolant Temperature (ECT) Sensor Replacing?

http://schematicsdiagram.blogspot.com/2011/12/gmc-engine-coolant-temperature-ect.html

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Loosing Coolant?

http://whoisbyme.blogspot.in/2012/06/loosing-coolant.html

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Coolant temperature sensor dies again and again?

http://schematicsdiagram.blogspot.com/2012/01/coolant-temperature-sensor-dies-again.html

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2000 Daewoo Lanos: Where to Add Coolant?

http://repairhelpcenter.blogspot.in/2012/06/2000-daewoo-lanos-where-to-add-coolant.html

Blue Water Warning Light on Dash?

http://whatisbyme.blogspot.in/2012/07/blue-water-warning-light-on-dash.html

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Replacing Oldsmobile Engine coolant sensor?

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How to test Engine coolant temperature sensor?

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Replace Coolant Sensor Module on Oldsmobile?

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These details will help.

Thanks.

does the engine run badly while idling at 5 miles an hour?

See if the plugs are oily first of all and check back with us

High idle is expected because of settings the coolant and air temp sensors set up with the computer. "cold start choke" The light coming on can be contributed to a rich fuel mixture that lasts too long. The 02 sensor picks that up and triggers the light. So, Your engine coolant sensor may well be the problem.

either the starter motor is loose or the teeth are stripped from the starter motor which means it cant connect to the flywheel to turn the engine

check you tail bulbs as you have a broken circuit

dealers for a computer set ut up