Check engine light, code 25.
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Joined: Sep 2001
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Check engine light, code 25.
I have a '90 LS 400 with 160K miles. Maintain it myself with the help of genuine Lexus repair manuals. I read out the check engine error code and it displays a '25'. The book leads me to a whole lot of possible failing components. Does anyone have a hunch as to what is most likely to cause this problem?
Please check post "Trouble code# 25" on the SC400/300 Models forum.
Last time I checked it was on the secound page.
It should give you an idea on what could be causing this code.
Hopefully this will help,
Chris K
95 SC400
Last time I checked it was on the secound page.
It should give you an idea on what could be causing this code.
Hopefully this will help,
Chris K
95 SC400
Lexus Champion
Joined: Feb 2001
Posts: 1,603
Likes: 5
From: Las Vegas, NV
Re: Check engine light, code 25.
Originally posted by Ned Bennett
I have a '90 LS 400 with 160K miles. Maintain it myself with the help of genuine Lexus repair manuals. I read out the check engine error code and it displays a '25'. The book leads me to a whole lot of possible failing components. Does anyone have a hunch as to what is most likely to cause this problem?
I have a '90 LS 400 with 160K miles. Maintain it myself with the help of genuine Lexus repair manuals. I read out the check engine error code and it displays a '25'. The book leads me to a whole lot of possible failing components. Does anyone have a hunch as to what is most likely to cause this problem?
The manual show you how to check the voltage between .45V, so check on that, you will understand more once you check it.
the other problem might be TPS throttle position sensor, or MAF mass air flow, cheapest I know is $633, heard that some one can get it for $400
Lead Lap
Joined: Feb 2001
Posts: 707
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From: California
Re: Check engine light, code 25.
Originally posted by Ned Bennett
I have a '90 LS 400 with 160K miles. Maintain it myself with the help of genuine Lexus repair manuals. I read out the check engine error code and it displays a '25'. The book leads me to a whole lot of possible failing components. Does anyone have a hunch as to what is most likely to cause this problem?
I have a '90 LS 400 with 160K miles. Maintain it myself with the help of genuine Lexus repair manuals. I read out the check engine error code and it displays a '25'. The book leads me to a whole lot of possible failing components. Does anyone have a hunch as to what is most likely to cause this problem?
Good luck.
Lexus Champion
Joined: Feb 2001
Posts: 1,603
Likes: 5
From: Las Vegas, NV
Re: Re: Check engine light, code 25.
Originally posted by DevildogIS300
Lean malfunction code caused by a bad Oxygen sensor. Probably one of the main sensors. Get it checked out. Don't try to replace the sensor yourself. Many times they seize in the manifold. If you don't know what your doing, you might ruin the threads and need a new manifold.
Good luck.
Lean malfunction code caused by a bad Oxygen sensor. Probably one of the main sensors. Get it checked out. Don't try to replace the sensor yourself. Many times they seize in the manifold. If you don't know what your doing, you might ruin the threads and need a new manifold.
Good luck.
The old O2 sensors already have anti-seize on but it is very hard to take out... save money on my parts. Cost me $245 for the O2 sensors. Dealer will cost me $500 to replace the O2...
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Check engine light, error code 25
The right main oxygen sensor was defective. I replaced both from Irontoad for $103 each and $8 shipping. Easy to do and takes an ordinary combination wrench #22. Problem was easy to troubleshoot, but I first went down wrong path because I didn't have good meter connections on check plug connector. Used anti- seize compound when installing.
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Lexus Champion
Joined: Feb 2001
Posts: 1,603
Likes: 5
From: Las Vegas, NV
Re: Check engine light, error code 25
Originally posted by Ned Bennett
The right main oxygen sensor was defective. I replaced both from Irontoad for $103 each and $8 shipping. Easy to do and takes an ordinary combination wrench #22. Problem was easy to troubleshoot, but I first went down wrong path because I didn't have good meter connections on check plug connector. Used anti- seize compound when installing.
The right main oxygen sensor was defective. I replaced both from Irontoad for $103 each and $8 shipping. Easy to do and takes an ordinary combination wrench #22. Problem was easy to troubleshoot, but I first went down wrong path because I didn't have good meter connections on check plug connector. Used anti- seize compound when installing.
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