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Oxygen Sensor (O2) Bank 1, Sensor 2 DIY

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Old 08-28-10, 03:02 PM   #1
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Default Oxygen Sensor (O2) Bank 1, Sensor 2 DIY

For those that have known my Mexican adventures one of the worst aspects was dealing with the gasoline. Both my air/fuel sensors (A/F Sensors) and O2 Sensor suffered. Recently I replaced my a/f sensors, but now came time to replace the last sensor, the O2 sensor or Oxygen Sensor at Bank 1, Sensor 2, which is after the main catalytic converter underneath the vehicle.

This is no easy task but the tools are a little simpler.

One socket wrench with both a 14mm and a 12mm extension.
A Denso 234-4215 Oxygen Sensor


Optional:
Rugged black electrical tape (not the shiny vinyl stuff)
Scissors
Flathead screwdriver
Anti-Seize lubricant

-----------------------------------------

One forward note:

I had the tube modified where the O2 sensor fits modified in Mexico. It is bigger, but the O2 sensor bung is exactly the same.
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Old 08-28-10, 03:04 PM   #2
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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.
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Old 08-28-10, 03:05 PM   #3
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Pop off the plastic covers and this will reveal a pair of bolts.
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Old 08-28-10, 03:06 PM   #4
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Use a socket wrench with a 14mm attachment to remove these two bolts.
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Old 08-28-10, 03:08 PM   #5
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Now move the seat as far forward as possible and go behind the seat until you can access these points.
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Old 08-28-10, 03:09 PM   #6
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Pop off the covers to reveal the bolts on both sides.
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Old 08-28-10, 03:11 PM   #7
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Use the socket wrench with 14mm extension again to remove the two bolts.
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Old 08-28-10, 03:13 PM   #8
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Now before you can move the seat, there are a few electrical connections underneath the front area of the seat that need to be disconnected. First, you will see a yellow electrical connector shown here below.
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Old 08-28-10, 03:14 PM   #9
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Close by will be a black electrical connection that also needs to be uncoupled.
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Old 08-28-10, 03:15 PM   #10
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Now it should look like this, but there is still one more step before the seat can be moved.
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Old 08-28-10, 03:17 PM   #11
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This small plastic piece also needs to be pulled off.
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Old 08-28-10, 03:18 PM   #12
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Now I picked the seat up and I put it in the back as shown. You may want to lay down a mat to protect any leather or other sensitive areas.
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Old 08-28-10, 03:21 PM   #13
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Now the floor should look like this.

I should mention that technically the carpet needs to be pulled up in order to get to the sensor connection area. I am not going to prescribe one certain way or another as far as getting to the connection area, but I did tear up a bit of my carpet to show everyone exactly where the sensor is and what you will have to deal with. It may be possible to not even remove the seat and make a small tear in the carpet (I will show later) in order to access the sensor area. Again, take a look at the pictures and decide what is best for you.
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Old 08-28-10, 03:23 PM   #14
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Now, I am going to pull up the carpet along the side here. There is not much leeway as the carpet does not pull up cleanly like picking up a carpet or rug off the floor.
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Old 08-28-10, 03:26 PM   #15
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Here is what you will see.

The connector is very tough to get at an uncouple. A flathead works but you may not get enough leverage on it no matter how hard you try. Bear with me as I will show some pictures in a bit of when I cut through the rug so you can get a better idea of how it looks from the top.
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300, 99, back, bank, bank1, change, diagram, forgetting, lexus, lx470, oxygen, put, rx, rx300, sensor, sensor2

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