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

Is this pre cat or post cat sensor

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Old 06-25-19 | 01:08 PM
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Default Is this pre cat or post cat sensor


Old 06-25-19 | 03:33 PM
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post cat sensor
Old 06-25-19 | 04:00 PM
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Would u know which MM would fit into the o2? I’m trying to get one of those spark plug defoulers on there to throw the CEL light
Old 06-25-19 | 04:25 PM
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They’re 7/8” or 22 mm
Old 06-25-19 | 04:33 PM
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Just replace it,runs about 50 bux on Walmart.com.
Old 06-25-19 | 04:46 PM
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Wow, you leaking a little fluid there? I don't think those rocks are gonna soak it up.
Old 06-25-19 | 04:57 PM
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Originally Posted by deanshark
Wow, you leaking a little fluid there? I don't think those rocks are gonna soak it up.
Yeah it’s power steering, the pressure lines are leaking bad
Old 06-25-19 | 07:19 PM
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Originally Posted by kambam3627
Would u know which MM would fit into the o2? I’m trying to get one of those spark plug defoulers on there to throw the CEL light
7/8" or 22 mm is the size of the hex on it.

But the threads are standard M14-1.25. BTW, that is the same as a standard spark plug thread. So your local auto store should have a Lisle spark plug thread chaser, and that would work to clean out the threads.
Old 06-25-19 | 10:55 PM
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Originally Posted by spuds
Just replace it,runs about 50 bux on Walmart.com.
Don’t you have to tear into the floor to replace the sensor? No thanks lol
Old 06-28-19 | 10:11 AM
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Originally Posted by kambam3627
Don’t you have to tear into the floor to replace the sensor? No thanks lol
It's really not that bad. Pop the gas pedal off and pull the carpet back, if I remember correctly. Should take less than 10 minutes.
Old 06-28-19 | 10:39 AM
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Originally Posted by kambam3627
Don’t you have to tear into the floor to replace the sensor? No thanks lol
I remember alot of people saying "oh no, I gotta take out the interior". Not true. As EthanS says, "pull the carpet back" and disconnect the O2 sensor. I haven't done any yet in my cars but IF the time comes, it's easy. When reinstalling the sensor it's torqued at 33 ft lbs.
Old 06-28-19 | 08:12 PM
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I have no idea how to take the pedal out, the threads I’ve read aren’t clear so I haven’t tried
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