O2 Sensor replacement on Impreza II 1.5

[MarcF]

Hello,

I am new to this forum and I have registered in order to help a good friend who drives a Subaru. I am located in Europe and I‘m a hobby mechanic since 20 years, mainly working on BMWs from the 80s/90s until present, and other European brands.

A good friend of mine drives a 1.5 Impreza II, MY 2007, with about 250k km and since sone time he has an increased fuel consumption and a check engine light and I diagnosed that the pre-cat Oxygen sensor needs to be replaced.

My problem is now that I am having some trouble in identifying the needed part. The installed sensor seems to have never neen replaced before. It has a 6-pin connector, with 4 wires (blue, white and 2x black) and a blue protection sleeve. I have checked many online stores for car parts which i regularly use for Euro car parts, but when identifying the car on those sites,  they only find sensors with 4 pin connectors which are obviously not correct.

Also from what i read, most people recommend using DENSO sensors which I would like to do. However, checking Denso‘s catalogue (https://www.denso-am.eu/media/1462794/2020_dels_web.pdf) they dont list a 1.5 engine on the Impreza II. By comparing the engine to photos online, it seems that the car has an EL type engine (not the EJ type engine). Therefore my closest assumption would be that I need to buy a DENSO DOX-0361 sensor, which is what they list for the EL15 engine in the Impreza III.

It is really frustrating for me to try and find a part for a car brand which I am not used to work on, even though it‘s something as simple as an O2 sensor :-) Therefore I would really apreciate any help you could provide to make sure that I order the correct part:

- is there some way to make sure that the engine is actually an EL15, maybe using some sort of VIN Decoder? I tried some VIN decoders but was only able to find out that it‘s a 1.5. I have also linked a phito of the engine below.

- can you confirm that for the EL15, the adequate DENSO O2 Sensor would be the DOX-0361?

Here are some photos from the engine bay:

https://www.flickr.com/gp/190165482@N04/07MAB6

https://www.flickr.com/gp/190165482@N04/JM285R

https://www.flickr.com/gp/190165482@N04/647h24

https://www.flickr.com/gp/190165482@N04/3zWt6X

https://www.flickr.com/gp/190165482@N04/b3HzgE

Thanks a lot in advance for your help!

Cheers,

Marc

[Rampage]

Looking at the catalog you posted, and a picture of that sensor, I would say yes, the DOX-0361 will fit.

It has the 6 pole connector with 4 wires. And, in your picture it looks like there is a flange under the hex.

[MarcF]

Thank you for your feedback. This is also why I initially believed that this sensor should be the right one, but I am still wondering why it's not simply listed in the Denso catalogue, as if the Impreza II never existed with a 1.5 engine...

Also, I looked the car up on the Subaru parts catalogue and for the EUR version of the G11 2007 1.5 Impreza it gives me the OEM part number 22641AA400, for which I cannot find any cross reference to Denso  Exhaust — Illustration #1, Subaru IMPREZA — Subaru parts catalog (opposedforces.com) When looking in the engine section it actually does list an EL15 engine (and not an EJ15). Now when I change the car identification to a G12 2008 Impreza 1.5, which also has the EL15 engine, it gives me another reference for the O2 sensor: 22690AA891 Exhaust — Illustration #1, Subaru IMPREZA — Subaru parts catalog (opposedforces.com)

I found one website which indicates 22641AA381 and 2641AA480 as cross-references for the DOX-0361, which is a match to neither of the OEM numbers which Opposedforces.com suggests.

Somehow it still feels that something is not right here - maybe it's just me not being used to Subaru :-)

[Rampage]

5 hours ago, MarcF said:

I am still wondering why it's not simply listed in the Denso catalogue, as if the Impreza II never existed with a 1.5 engine...

I used to work at a large auto parts store and have seen the same thing multiple times. No part listed. Even with paper catalogs.

I looked at the Bosch catalog and it only lists the SOHC 1.5 and the years 2000 - 2007 are blank for the upstream sensor.

The part numbers 22641AA381, 2641AA480 and 22641AA400 does not exist on the US Subaru sites I looked at. I did not check all of them.

Using Google I found 22641AA400 is a good number for the 1.5 (in stock at some places) and it looks like your sensor.

 

[1 Lucky Texan]

are there useful or cross-referenceable (?) numbers on the installed part itself?

[MarcF]

I was unfortunately unable to get any photo where the part references would still be readable. I think most of it has already disappeared by corrosion.