Subaru O2 sensor

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Re: Subaru O2 sensor

Postby immortality » Sat Aug 25, 2018 10:41 am

LOL, I was considering the exact thing last night. I have a genuine Delphi Holden 4 wire O2 sensor in the garage, so by the above I'm assuming the sensors are much the same? what changes per vehicle is the wiring tail length and plug used?

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Re: Subaru O2 sensor

Postby The1 » Sat Aug 25, 2018 10:48 am

there all designed to swing at stoich, only thing that maybe an issue is using a heated sensor without the heater, may reduce it's life? i dunno, it would take longer to warm up but in theory should work fine.

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Re: Subaru O2 sensor

Postby vlad01 » Sat Aug 25, 2018 7:35 pm

Pretty much just plug and pin out. They all should be the same if its a NB.

I havvn't used stock one for years on my cars. I always wire up and replace them with a L67 4 wire heated type in my 2 wire VPs as the heater makes a big difference on extractors, stock ones can't get hot enough to work all the way 800mm from the heads and throw up an error as soon as it gets to closed loop mode.
I'm the director of VSH (Vlad's Spec Holden), because HSV were doing it ass about.

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Re: Subaru O2 sensor

Postby The1 » Sat Aug 25, 2018 7:40 pm

i had that on a few, there is a o2 warmup timer you can change, on ecotec pcm's anyway.

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Re: Subaru O2 sensor

Postby vlad01 » Sat Aug 25, 2018 7:43 pm

Yeah it wasn't a time issue, it physically dropped in and out of operations depending on engine load, just cooled off too much. The VRs have a heated O2 as they are much farther from the VP/VN location.
I'm the director of VSH (Vlad's Spec Holden), because HSV were doing it ass about.

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Re: Subaru O2 sensor

Postby immortality » Sat Aug 25, 2018 8:16 pm

I have the spare 4 wire here as I was about to upgrade the one on the 304.

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Re: Subaru O2 sensor

Postby delcowizzid » Sat Aug 25, 2018 8:34 pm

Have a look at pics of stock Subaru and aftermarket for Subaru they only have like 4 small holes in the sensor to change the characteristics of the flow of exhaust into them you'll find a Commodore one might not work to well
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Re: Subaru O2 sensor

Postby pman92 » Sat Aug 25, 2018 10:25 pm

What's wrong with the Subaru one? Has it thrown a dtc for heater circuit? Ive lost count of the amount of subaru sensors I've replaced with open circuit O2 heaters. See it occasionally on other makes but it's almost always a Subaru, not sure why.

Assuming its a narrowband I see no reason you could not use the 4 wire sensor you already have.

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Re: Subaru O2 sensor

Postby immortality » Sun Aug 26, 2018 10:40 am

Were getting a couple of codes just using the black plug under the dash and reading the flashes which are a bit annoying. Now I thought it was 128 which is a thermostat fault but it could also be 137 which seems to be an O2 sensor fault. Also getting what I believe is a 15 which I think might be an injector code.

All this is for a 2002 Subaru Legacy B4 RS30 with EZ30 motor.

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