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Old 11-14-2007, 11:20 AM   #1 (permalink)
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Default O2 Sensor replaced Pics inside!!!

So since today was 57 F (14 deg C) I decided to change my O2 sensor I picked up yesterday. I ordered it from Subaru Genuine parts dot com. Cheaper than buying it here in Canada.



I disconnected the battery, then I removed the back part of the air filter box and the passenger side wheel to have better access to the O2 sensor wire.

I then unplugged the O2 sensor wire. Red below



Here is a view of the O2 sensor from the passenger side wheel well. Red O2 Sensor, Green tie down. ****Ensure you put the wire back into this tie down. Its to prevent the wire from being wrapped around the driveshaft****



I tried using a O2 sensor socket, but couldn't really get it in due to being so close to the engine subframe.




So I used a 22 mm flare nut wrench from the engine bay. I couldn't really get to the sensor from underneath. I was able to turn the wrench behind the drive axle thanks to the slight bend in the wrench. Afterwards it was easy to remove by unscrewing it by hand. I was also twisting the wire counterclockwise while turning the O2 sensor to prevent the wire from binding.






This is what it looked like




I then reconnected the battery and started it up and let it warm up to operating temperature.

It took me about 1/2 hour to replace the sensor. Was fairly easy to do. As usual, more tech stuff to be posted in the future!!!!
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Old 11-14-2007, 11:31 AM   #2 (permalink)
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Thanks for posting huck! What did the 02 sensor run you? Just want to be prepared when I need to replace them on the wife's.......did you get yours from a vendor here?
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Old 11-14-2007, 11:42 AM   #3 (permalink)
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^Nope, from the US. Was cheaper and I am sick getting shafted when it comes to buying something here in Canada. It cost me 83.59$ incl. tax and shipping.
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Old 11-14-2007, 12:02 PM   #4 (permalink)
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Was the sensor you replaced the front or rear? I have replaced both on my Forester. The front one on my Forester is called the A/F sensor, which the ECU uses to meaures the air fuel mixture when running in closed loop. The rear (after the CAT) is called the O2 sensor, which measures the efficiency of the CAT. This is the one that will gives you the CEL P0420 if the CAT is going south.

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Old 11-14-2007, 12:13 PM   #5 (permalink)
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^Front sensor.

Just got back from a drive. Really smooth and NO MORE LURCH. I was lurching ever since I had the car. Took her out on the highway and kicked that extra crap out of the cats . Smooth acceleration. Smooth idle

Did the grounding kit a make a difference? Maybe.

So if people here are getting odd idling, lurching and crappy response, its maybe your sensor that is about to crap out. Remember, you won't always get a CEL.
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Old 11-14-2007, 07:16 PM   #6 (permalink)
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Thanks for the great pics, huck. Did you have to remove the inner skirt from the passenger side front wheel well to get to the sensor from above, or just the tire/wheel? I'll be ordering a new A/F sensor tomorrow for my 02 Forester and was a bit worried about how to get at that thang!
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Old 11-14-2007, 07:29 PM   #7 (permalink)
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Thanks for the great pics, huck. Did you have to remove the inner skirt from the passenger side front wheel well to get to the sensor from above, or just the tire/wheel? I'll be ordering a new A/F sensor tomorrow for my 02 Forester and was a bit worried about how to get at that thang!
Just removed the wheel.
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Old 11-15-2007, 12:50 PM   #8 (permalink)
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BEEN THERE DONE THAT, HUCK!, I used same wrench , looks like you got it at PRINCESS AUTO??
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Old 11-15-2007, 01:19 PM   #9 (permalink)
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Originally Posted by 2.5x_sleeper View Post
Was the sensor you replaced the front or rear? I have replaced both on my Forester. The front one on my Forester is called the A/F sensor, which the ECU uses to meaures the air fuel mixture when running in closed loop. The rear (after the CAT) is called the O2 sensor, which measures the efficiency of the CAT. This is the one that will gives you the CEL P0420 if the CAT is going south.
It is also not worth replacing the rear sensor.
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Old 11-15-2007, 03:10 PM   #10 (permalink)
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It is also not worth replacing the rear sensor.
I agree, no need to mess with the rear O2 sensor, unless you start getting CEL P0420.

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Old 11-15-2007, 06:53 PM   #11 (permalink)
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Even then. Do a mechanical fix and leave it. The rear O2 doesn't do anything important. It fails WELL before the cat will.
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Old 11-15-2007, 07:00 PM   #12 (permalink)
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Congrats & eatleast yours came out nice & neat.

Our 02 Forester S's didn't look that nice when I replaced it.

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Old 11-16-2007, 03:38 AM   #13 (permalink)
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Thanks for the tips. I too am waiting for a new one to arrive from Jackie @ Annapolis. Hopefully it should be here today so I can install it sometime this week end.
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Old 11-16-2007, 04:32 AM   #14 (permalink)
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Quote:
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^Nope, from the US. Was cheaper and I am sick getting shafted when it comes to buying something here in Canada. It cost me 83.59$ incl. tax and shipping.
Agreed huck! I think I'll replace the front in the spring on the wife's 03.
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Old 11-16-2007, 06:39 AM   #15 (permalink)
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Even then. Do a mechanical fix and leave it. The rear O2 doesn't do anything important. It fails WELL before the cat will.
What do you mean by a mechanical fix? Mine is going off right now and I'd just as soon not buy another sensor.
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