Who makes the OEM O2 sensor?

**jamesm113** · #1: 03-02-2012, 12:23 PM

Anyone know who makes the OEM oxygen sensor for our generation of Legacys? I've heard it might be bosch or desno.

**FreedomPenguin** · #2: 03-02-2012, 01:15 PM

i just replaced mine last week, it was a bosch.

**broknindarkagain** · #3: 03-02-2012, 09:06 PM

I believe its DENSO. They make a bunch of factory stuff in our cars.

**broknindarkagain** · #4: 03-02-2012, 09:06 PM

FYI - you can pick up DENSO o2s for cheap on ebay and amazon. I just ordered one for 40 bucks

**jamesm113** · #5: 03-02-2012, 10:19 PM

I know, I love Amazon. I buy nearly all my parts there.

The Densos are showing as $55 for my model though.

**lulzcow** · #6: 03-03-2012, 11:27 AM

Get the Denso's. Bosch are 100ish from an auto store. And if their spark plugs vs. the Japanese NGKs are any indication, it's best to keep our cars speaking Nihongo

**lulzcow** · #7: 03-03-2012, 11:28 AM

That's Japanese for Japanese, in case Nihongo o hanashimasen

**jamesm113** · #8: 03-28-2012, 10:45 AM

Replaced it last night. Only had a 22mm flare nut wrench from harbor freight, wouldn't come out with PB blaster, or after warming the car up. But after I heated the sensor with a torch, it came right out. When I do it again, I'll use the SAE version of the wrench, the 22mm was definitely not a perfect it and started to strip the sensor a little.

Also, the sensor I pulled was a Bosch

Maybe it was replaced before, but I have all the services records dating back to 2000, and it's not in there.

**imfamousG** · #9: 03-28-2012, 11:06 AM

i just got a universal o2 sensor from Bosch and just had to splice the wires its not hard just a lil time consuming but much cheaper

**silentguy** · #**10:** 09-13-2012, 02:17 PM

What special socket should I use to replace the O2 sensor ?
There are some with a cut away for the wire, anybody use these ?

Lisle 12100 Oxygen Sensor Socket : Amazon.com : Automotive

Or will a 7/8 " socket or other size wrench work ?

**jamesm113** · #**11:** 09-13-2012, 02:19 PM

Quote:

Originally Posted by silentguy

What special socket should I use to replace the O2 sensor ?
There are some with a cut away for the wire, anybody use these ?

Lisle 12100 Oxygen Sensor Socket : Amazon.com : Automotive

Or will a 7/8 " socket or other size wrench work ?

If I remember correctly, that wont fit.

**monkeyposeur** · #**12:** 09-13-2012, 05:42 PM

I've used a large crescent wrench. Luckily my sensor wasn't seized.

**Osei** · #**13:** 09-13-2012, 05:46 PM

7/8 will work. But if OP is going to work on Subaru's constantly, he needs to get metric. In this case 22mm. (corrected. thx Jamal, guess I can't convert in to mm, and my memory is toast)
If you can, use a vise grip or similar to hold the bung.
I ripped one right off the weld and had a hard time getting it rewelded.

O.

**SomethingWittyAsAUsername** · #**14:** 09-13-2012, 08:32 PM

If you have an advance nearby I know they have loaner O2 sensor sockets

**jamal** · #**15:** 09-13-2012, 08:41 PM

should be 22mm. If it's really in there a socket is a good idea to keep from rounding it off.