Question about 1991 Lexus LS 400

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I have a 91 lexus ls 400 and the temp gauge goes all of the way up as far as it can go when u start it but doesnt over heat and my spredometer stops wirking for a second then works some times i lighty tap the top of the dash and comes back on and it reads 10mph off showes that i am going 25 but i am doing 35 what can cause that any info woild b great thank you

Posted by Richard Shull on


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Bogdan Odwazny

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I think temperature gauge is a bad need to be replaced, use good one cheap may cause a problem.Speed sensor could be bad replaced.

Posted on Sep 24, 2017



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Sounds like some kind of short or loose connection in the instrument cluster. A few years ago I had a van that would intermittently decide to not crank when the key was turned even though everything else worked. I went online to a forum for that brand and model vehicle and did some searching for a no crank condition and found others who had experienced the exact same thing and described what was going on and how to repair it. I followed those instructions and found exactly what they described, performed the repairs which was the resoldering of some cracked solder joints where the wiring harness connected to the instrument cluster, reinstalled the cluster and never had another moments trouble. That was on a 1998 so your 1991 could be experiencing a similar problem. But instead if just taking things apart and trying to find the problem, go to a Lexus forum and do a search for something like "temp guage maxes out when key turned on and starter stops working but then starts but reads 10 MPH too high after tapping on top of dash". You might have to try different wordings to find whay you want but I'll bet you dollars to doughnuts somebody else out there has had the same problem and talked about it on the forum. You can even just Google your question but you'll get answers for all kinds of vehicles and not even remotely similar problems. Good Luck.

Posted on Sep 24, 2017


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  • 1 Answer

SOURCE: 1994 lexus ls 400 problem with dash board light

Try rotating the ignition switch slightly after you turn it to on and see if the lights come on...had the same problem and changed the switch fixed the problem...

Posted on Feb 14, 2009


  • 2 Answers

SOURCE: lexus ls 400 air suspension stop working

If this light is flashing, there is a problem somewhere in your air suspension system. You can check to make sure its powered on in the trunk on the driver side. Behind the carpeting. This is a common issue with that particular year and model. The system tends to go bad righ around the 15 year old mark or so. Also if the light is flashing, the system is not working. Your just riding on the regular suspension.

Hope it helps

Posted on Feb 19, 2009


  • 37 Answers

SOURCE: I have a 93 Lexus LS 400 and the RPM gauge does

trans problem

Posted on Mar 01, 2009


Mike Vincent

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SOURCE: 92 lexus ls 400 check engine and traction control light came on at the same time, 92 lexus ls 400.

the track off light will come everytime yhe check engine light comes on. this is normal. you need to have the check engine light checked can go to your local parts house they will scan it for so you at least see what area you problem is in and then you can start from there. let me know lf you find out youe engine codes.

Posted on May 27, 2009


  • 2841 Answers

SOURCE: my battery died over the weekend and my radio wont work

You need the code. The code is specific to your radio, and no one can tell you that specific code. Do not try any codes until you have the correct one or you will lock the radio. Look long and hard throughout your owner's manual and all other manuals you have with the car. If you cannot find the code then contact the dealer that sold the car originally. They may have the code stored in their database. You can also go to any Lexus dealership and they can tell you the code with the VIN # off the car. Other than that I know of no way to get the code unless you remove the radio and write down the serial #. With that number many sites will sell you the code. But you are better off to pay a Lexus dealer to give you the code, and they just might do it for free if you ask nicely.

Posted on Oct 06, 2009

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