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Old 12-16-14, 12:36 PM
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Oxygen Sensor (O2) Bank 1, Sensor 2 DIY

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Old 05-21-14, 06:25 PM   #106
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Quote:
Originally Posted by Rudy602 View Post
I don't know what the "access cover" that they refer to is. Bank 1 sensor 2 on a RX300 is behind the cat and in front of the resonator which is under the driver's side and why the connection is under the driver's seat. Read the thread. It has good info and pics. The thread postings are accurate, I don't know about your service manual.
I don't either, but since I am not having issues with that sensor, I wasn't going to try looking for it. However, while crawling under my RX today doing a caliper swap, I took some pictures and one of them shows the wiring for the O2 sensor at the bottom, clearly on the driver's side of the vehicle.

I think I'm chalking it up to a typo that wasn't caught.
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Old 05-26-14, 06:50 AM   #107
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I've noticed that a lot of service manuals have inaccuracies or leave out pertinent information. You'd think that if you pay considerable money for an alleged "factory" service manual, you'd get good info. but that isn't always the case. Who knows what gets lost in translation and editing - esp. by those who aren't mechanics.
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Old 05-26-14, 07:00 AM   #108
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I simply refer to the one under driver-seat as downstream sensor.

Salim
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Old 05-27-14, 11:28 AM   #109
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I used to work for a US distributor of a Japanese precision equipment company and the literal translations were often amusing if not downright confusing. It's because of this job that I feel so comfortable tinkering with my Japanese designed vehicle. The parts diagrams look very similar. I swear that some of their mechies must have gone to the same engineering school!

Though I don't ever think they mistook left from right on any of their parts manuals. Easier to do if you have to manufacture right hand drive cars and trucks, I guess.
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Old 06-04-14, 06:06 AM   #110
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Originally Posted by salimshah View Post
I simply refer to the one under driver-seat as downstream sensor.

Salim
So do I - but a lot of manuals don't and this can lead to confusion, esp. with DIYs who have less understanding of the function and process involved and even more so if the manual says it is located under the passenger seat. It's nice to have this forum for the great info, pics, and clarification.
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Old 03-27-15, 07:46 AM   #111
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Cool Replacing a Lexus RX sensor similar to Lexus GS

Hey,

I just found this thread and noticed that the procedure to replace an o2 sensor on a first generation Lexus RX is almost completely the same as on my 2006 Lexus GS 300 AWD.


I actually went the extra mile and recorded the entire process. I'm sure it will help anyone attempting to do this on any Lexus with the exception of the Lexus LFA supercar

BTW: I have several Lexus road testing clips, races, and service and repair videos on my YouTube Channel already, with a ridiculous amount of videos still waiting to be edited.

Here's my Lexus o2 Sensor Replacement Tutorial

Last edited by LexVoitek; 03-27-15 at 07:49 AM.
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Old 07-13-15, 02:53 PM   #112
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Originally Posted by Lexmex View Post
The first step is to remove the driver's seat (it may be possible not to do this and I will get to that later), but even the service manual mentions removing the seat, so I will do it here.

Move the driver's seat as far back as possible to reveal these two areas.
I replaced the A/F mixture sensor under the engine last year. Last week and CEL
came on again and showed that the other A/F mixture sensor near the manifold is
bad. So I opened the hood and replaced it with the Denso sensor. It only took me
2 minutes with my oxygen sensor tool and wrench. (because I had soaked it with
PB Blaster for 30 minutes to loosen it up)

The only sensor that I've never replaced is the oxygen sensor on the exhaust,
under the driver's seat. That sensor is the one that came with the car and has
never ever been replaced. I figure I might as well do it now. The Denso sensor
for that one is only $50 on Amazon.

Is it absolutely necessary to remove the driver's seat for this one? The carpet
under the seat has been pre-cut from the factory. When I reached in there with
my fingers, I felt the wire/connector of the oxygen sensor. What if I just make the
cut bigger? My carpet is black, so it will not be visible.

Thanks!
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Old 07-20-15, 08:04 PM   #113
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Default to remove or not to remove the seat

It can be done either way. You can remove the seat and have more room to work - I moved the seat as far forward as it would go and cut the carpet a little.
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Old 09-13-15, 07:14 PM   #114
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The left side is the driver's side in the U.S., but is the passenger side in Japan. Same location, failure to convert!
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Old 09-14-15, 08:52 AM   #115
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Quote:
Originally Posted by sarah View Post
I replaced the A/F mixture sensor under the engine last year. Last week and CEL
came on again and showed that the other A/F mixture sensor near the manifold is
bad. So I opened the hood and replaced it with the Denso sensor. It only took me
2 minutes with my oxygen sensor tool and wrench. (because I had soaked it with
PB Blaster for 30 minutes to loosen it up)

The only sensor that I've never replaced is the oxygen sensor on the exhaust,
under the driver's seat. That sensor is the one that came with the car and has
never ever been replaced. I figure I might as well do it now. The Denso sensor
for that one is only $50 on Amazon.

Is it absolutely necessary to remove the driver's seat for this one? The carpet
under the seat has been pre-cut from the factory. When I reached in there with
my fingers, I felt the wire/connector of the oxygen sensor. What if I just make the
cut bigger? My carpet is black, so it will not be visible.

Thanks!
I saw this today and may be a bit late in responding:
You have to make sure that the plug can pass through the carpet and the grommet on the floor. At the factory the grommet was installed before the carpet so a tiny hole to pass the plug was enough. If you are going to work with the seat insitu then you mostlikely will have to cut the carpet hole a bit bigger. If you remove the seat you can potentially work with a smaller hole. At the end the carpet will be covered by the seat and you can use a thread and a needle to mend the cut.

Preemptively changing the sensor .... I am not in favor of that. If it is a maintenance item, yes, if not then wait for it to cause a CEL.

Salim
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Old 09-21-15, 09:20 PM   #116
Rudy602
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If my memory is correct, nothing needs to go through the hole in the carpet except your fingers in order to unplug the old sensor connector and then reconnect the new one. The connector is then removed and replaced through the floor from below through the hole plugged by the grommet.
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