LS - 1st and 2nd Gen (1990-2000) Discussion topics related to the 1990 - 2000 Lexus LS400

All LS400 owners with bad gas mileage READ THIS!

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Old 09-14-08 | 01:31 PM
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Originally Posted by Luke_in_SD
I am still confused on which sensor is being replaced.

Are you guys talking about the one on the top of the block which I don't know where it is, or are you talking about the one in the bottom of the radiator?
It's right here.
Attached Thumbnails All LS400 owners with bad gas mileage READ THIS!-timingbelt32.jpg  
Old 09-14-08 | 01:33 PM
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Originally Posted by paulg123
Everyone who has replaced this part or is going to, please let us know your MPG improvement. I get about 19mpg average, but with different driving I can get up to 23 in my '94.
420 miles on the last full tank. That was while running the AC for about 1/2 of those gallons too. MPG dramatically improved.
Old 09-18-08 | 06:52 PM
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I went ahead about bought the sensor at autozone today for 29.99.
I saw the other thread on this and it seems like its working for more and more people and for the last 6 months my car has been getting 15-16mpg so I thought I would give it a shot.

I'll let you guys know what happens and if it works I'll let the SC400 guys know about the good news. I own SC400 btw not an LS400 but same engine.
Old 09-18-08 | 08:05 PM
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Originally Posted by Luke_in_SD
I went ahead about bought the sensor at autozone today for 29.99.
I saw the other thread on this and it seems like its working for more and more people and for the last 6 months my car has been getting 15-16mpg so I thought I would give it a shot.

I'll let you guys know what happens and if it works I'll let the SC400 guys know about the good news. I own SC400 btw not an LS400 but same engine.
Big mistake buying it from autozone. Its not OEM, its a generic sensor, and I bet it wont work properly.
Old 09-18-08 | 08:06 PM
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Originally Posted by jasonburt
Their are 3 coolant sensors on the LS400. One is for the fuel and timing maps on the computer. One is for a timer for the cold start injector. One is for the tempurature guage on the instrument cluster.
There's a fourth one, that controls radiator fans, its located in the bottom of radiator.
Old 09-18-08 | 08:32 PM
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The guy 2 posts above me "avalon42" used an autozone sensor and look at his results

and so did

zoraone

https://www.clublexus.com/forums/sho...d.php?t=377171

Last edited by Luke_in_SD; 09-18-08 at 08:56 PM.
Old 09-19-08 | 08:58 AM
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Yup. For the record, I bought the sensor at Autozone. No ECU throw codes, but then again, didn't have any to begin with.

I think all it is is a thermosister, so generic or not, it's not an overtly complicated piece of equipment.

But Och may have a point, anyone willing to buy an OEM new and let us know if you have different results (better MPG)?
Old 09-19-08 | 09:28 PM
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I'm really happy to see everyone has been getting the results I have with this sensor. We are all extending the life of our Lexus engines,happiness,pocket book, and the environment. Hey were also sticking it to the oil companies!
Old 09-19-08 | 09:30 PM
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This sensor could help other board memebers other than the LS400 members. Can anyone maket this visible to all Club Lexus members?
Old 09-19-08 | 09:38 PM
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I'm gonna install soon. I have an SC400, same motor as you guys. but i noticed SC300 have the same part number. I can spread the word
Old 09-26-08 | 03:42 PM
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I just changed mine and I can tell already the car has more throttle response. But I have to reset the ECU?
Old 09-28-08 | 09:54 PM
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and where to buy it? links please
Old 09-28-08 | 10:37 PM
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Autozone or you can buy OEM Toyota/Lexus. Up to you.

You do NOT need to reset the ECU.
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Old 10-01-08 | 12:28 AM
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thanks for that pic avalon.. how much ish did you need to unbolt to get to it? not really mechanically inclined..
Old 10-01-08 | 09:32 AM
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Want to get on this.
Does anyone have the Toyota oem part # for the part shown?



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