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

oxygensensors.com tells me I need to remove seats to install sensors?

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Old 06-01-08 | 04:23 PM
  #16  
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Passenger side showing carpet removed and connector locations.
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Old 06-01-08 | 04:32 PM
  #17  
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I didn't take pics of underneath, because all the work was actually much easier, because the sensors are right there on the side of the exhaust, and because I was covered in black ****. But they all came off without much trouble even after 200K miles (still originals, btw). I had to buy a sensor removal socket (7/8", but they are all the same size as far as I can tell) - just a long socket with a slot cut in the side for the wire to get into. If you have a set of large crows foot wrenches then that might also work, or you could cut off the sensor down to the bolt to get a regular socket on, if you only want to undo the old one. But I would say for this year, you need the sensor socket to tighten up the new ones anyway.

I put copperease onto the threads (supplied with sensors).

The connectors came apart without much trouble (comparatively, since on vehicles there's just no such thing as a connector that is actually easy to undo).

I was having a hard time getting a ratchet onto the sensor socket while up there, until I remembered the 1" hex shape of the socket stem, which let me get a wrench on from the outside, and that proved to be much easier than the ratchet. Hence I didn't torque it (to 35 ft lb), I just guessed on that part. You need to collapse the gasket and then some.

Took me total 5 hours (and I'm no mechanic) including a trip to autozone, oil change, and lunch and a beer or two. 2/10 for difficulty. Vehicle runs fine - I'll see if the light goes out over the next few days.

-Dean

Last edited by deanbrown; 06-01-08 at 04:46 PM.
Old 06-01-08 | 08:01 PM
  #18  
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nice job Dean, u should reset ur ECU and see if it still comes up. u changed all 4 or just the 2 subs?
Old 06-01-08 | 08:34 PM
  #19  
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Thanks.

I changed all 4.
Old 06-02-08 | 08:40 PM
  #20  
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5 hours and all of that? You are the man! Way to go. I'm pretty sure you can reset the ECU by pulling the fuse and installing after a minute or so . . .
Old 06-06-08 | 08:23 PM
  #21  
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That's excatly how I did mine a few years ago. Not really a big job, but time consuming.
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