The other day my lexus started to overheat and once it got toabot 3/4 and the gage it would drop back down and so i figured the thermastat was going out. now four days later its overheating all the way so i got a new thermastat to change it out but where it looks like it would be there is what looks like a sensor so it was trippin me out alittle so i wanted to double check befor i took it off cause ive never seen anything like that.
It could be located near the water jacket at the intake manifold or possibly close to the water pump. Also it may be a separate housing where the return hose from the radiator meets the engine block.
SOURCE: car feels like it's misfiring or stutters
Turning off the CEL does not cure any problem, you have a ignition miss, U will have to have it put on a diagnostic machine to determine the cause of the miss.
SOURCE: lexus rx300 check engine/ vsc light
After having my oil changed, the next day the trac off light and vsc light came on and don't go off...can you tell me how to get them off? HELP
SOURCE: 2002 lexus sc430 problem
check for any devices such radio accesories , phone,glove box light,stop lights
SOURCE: How to locate the oxygen sensor in a LEXUS LS430 (Bank1 Sensor1)
the O2 sensor for bank one sensor one is located between the catalytic converter and the engine in the exhaust head pipe. see photo of your engine cylinder layout, the sensor u want to replace is the one at the cylinder #1 
bank on right.
SOURCE: Check engine light is on
no such thing as a catalytic computer... there is a catalytic converter ... part of the exhaust system so they may now be "guessing" that it's an O2 sensor. take the car to autozone... they will scan the codes for free.... post the codes here tho the lads and lasses there are pretty clever and will probably tell you what the codes mean.
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