Will it run without the Oxygen Sensor? - Subaru Forester Owners Forum
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post #1 of 14 (permalink) Old 07-13-2007, 05:36 AM Thread Starter
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Will it run without the Oxygen Sensor?

My CEL light came on and Advanced traced it to the front Air Fuel Sensor.

Of course no one has it locally ... I had to order it.

Won't be in until next week, in the mean time, can I remove the old one and still run the shaggin waggin??

Rick
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post #2 of 14 (permalink) Old 07-13-2007, 06:27 AM
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It should run, but you'll just throw a CEL and probably have some lagging performance/mpg.
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post #3 of 14 (permalink) Old 07-13-2007, 06:41 AM
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Why remove it and when you do what do you plan on putting in it's place? Just wait till the other one comes in is what I say.

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post #4 of 14 (permalink) Old 07-13-2007, 08:29 AM
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Umm, yea, if you remove it , its gona be hella loud !! .... You can leave it unplugged ... it will run fine ... just have bad gas mileage .....

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post #5 of 14 (permalink) Old 07-13-2007, 08:30 AM
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Roo can get you a good deal on one, been there done that. It is hard to find other than at dealers.

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Lots of suspension mods, no real engine mods

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post #6 of 14 (permalink) Old 07-13-2007, 08:42 AM Thread Starter
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Roo? are you out there?? Can you do better than $120 shipped??

They are nasty little things..very hard to find.

After searching last night online...turned out my local NAPA's price was the cheapest (Direct Sensor), but they had to order it.

I was going to pull it out before the new one arrived becuase this weekend is the only weekend I have free to curse and spit. I have never done an O2 sensor..not to mention a front O2 sensor. Figured I could take my time this weekend and figure it out. Anyone no where there is an install guide or tech note?

Rick

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post #7 of 14 (permalink) Old 07-13-2007, 09:02 AM
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post #8 of 14 (permalink) Old 07-13-2007, 09:34 AM
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Quote:
Originally Posted by white_forester View Post
I was going to pull it out before the new one arrived becuase this weekend is the only weekend I have free to curse and spit. I have never done an O2 sensor..not to mention a front O2 sensor. Figured I could take my time this weekend and figure it out. Anyone no where there is an install guide or tech note?

Rick
I did one not too long ago on our MY02, not sure if your 03 is any different. It's not too bad in my case, but not as easy I would've liked. Difficult to get access room.

Unplug the sensor (passenger side, between firewall and engine), then I jacked up the passenger side to put on jackstands, sprayed some PB Blaster on the old one, used one of those oxygen sensor sockets to loosen it up. Soaked it with a lot more PB Blaster again, and let it sit for some time before totally remove it and put the new one back in. Mine was probably tougher to remove since it has a lot more miles on it and kinda rusted. The special sockets are necessary since no way you can get your regulars anywhere near it. It's probably also easier to drive onto a ramp.
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post #9 of 14 (permalink) Old 07-13-2007, 10:32 AM Thread Starter
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re: limited access room ....is the sensor surrounded by a heat sheild???
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post #10 of 14 (permalink) Old 07-13-2007, 12:27 PM
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I believe there's an opening between heat shields, and the only way is to use the O2 socket to get it. The sensor sits on the top side of the converter, pointing/tilting towards the engine.
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post #11 of 14 (permalink) Old 07-13-2007, 06:29 PM Thread Starter
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yes, i saw that bad boy this evening....it had yellow housing around the four wires
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post #12 of 14 (permalink) Old 07-13-2007, 08:44 PM
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Yep - leave it in until the new one arrives and as already said, your fuel consumption will go up - and your exhaust will stink of rotten egg gas!

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post #13 of 14 (permalink) Old 08-29-2008, 03:58 PM
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Did you try jcwhitney.com for your sensor???
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post #14 of 14 (permalink) Old 08-29-2008, 07:44 PM
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^^

The front O2 sensor is also called the A/F, Air/Fuel sensor. If it's removed, I'd guess the engine would run poorly, if it runs at all. Without the A/F sensor the ECM has no way to monitor the mixture. I'd go with a high quality replacement for this sensor. Unlike the rear O2 sensor... just monitors the CAT, the front one is critical for proper engine operation.

My .02 cents worth...:)

Bobby...

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