Ls 400 code 25
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7th Gear
Joined: Mar 2024
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Ls 400 code 25
Just got ls 400 1992 with 162k miles and check engine light came on shows code 25 and TRAC OFF I changed the down stream O2 sensor and nothing change I heard that it could be the MAF SENSOR or The UPstream O2 sensor any suggestions ?
http://www.lexls.com/tutorials/intro/codereading.html
25 - Air-fuel ratio lean malfunction
it could be many issues and throwing parts at it is expensive, but i think you're on the right track with the o2 sensors. however the car has 2 downstream sensors, and 2 upstream as well so which one is it?
which one did you replace so far? since you have a new one, swap it to the other side. you cannot use a downstream sensor upstream and vice versa, but you can swap left to right.
25 - Air-fuel ratio lean malfunction
it could be many issues and throwing parts at it is expensive, but i think you're on the right track with the o2 sensors. however the car has 2 downstream sensors, and 2 upstream as well so which one is it?
which one did you replace so far? since you have a new one, swap it to the other side. you cannot use a downstream sensor upstream and vice versa, but you can swap left to right.
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7th Gear
Joined: Mar 2024
Posts: 7
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Racer
Joined: Nov 2015
Posts: 1,786
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From: NJ
There is a simple test you can do for Code 25 to test your upstream o2 sensors with a multimeter
I posted about this in February
https://www.clublexus.com/forums/ls-...l#post11675188
My car got code 25 a little over a year ago. I found my left bank upstream o2 was lazy after the test
I posted about this in February
https://www.clublexus.com/forums/ls-...l#post11675188
My car got code 25 a little over a year ago. I found my left bank upstream o2 was lazy after the test
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LS - 1st and 2nd Gen (1990-2000)
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Jul 10, 2024 05:46 AM
