Which O2 Sensor is the upstream?

[Iltl32]

07 Legacy 2.5i SOHC.

 

I have a code to replace the upstream sensor. Is that the one on the front passenger-side of the engine?

 

 

I purchased this part: https://www.amazon.com/gp/product/B075GTLJCQ/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1

 

All the reviews say it should be a direct replacement for the upstream, but the plug is just slightly different, so I'm wondering if maybe I'm replacing/purchased the wrong one. Or maybe I just have to splice the plug?

 

Thanks!

[madrig]

what is the code ?

 

upstream is the front one , on the header . its a air fuel ration sensor .

 

 

air fuel sensor is very important , make yourself a favor and buy an oem one , and yes is expensive ! long run you will save anyway .

 

https://parts.subaru.com/p/Subaru_2007_Legacy-Sedan-25L-4AT-4WD/SENSOR-ASSEMBLY-AIRFUEL-RATIO/49232483/22641AA36A.html

[Infosecdad]

Do not get aftermarket for the front O2, it'll just be a waste of money.

Get the OEM one.

[relative4]

Get a Denso, which is the OEM supplier.

[Iltl32]

Get a Denso, which is the OEM supplier.

 

Do you happen to know the Denso part number and/or a good vendor?

[relative4]

234-9123

Amazon

[Max Capacity]

we talk about them in this thread, its a sticky.

 

http://legacygt.com/forums/showthread.php/idea-web-links-saved-various-parts-219238.html

 

I was trying to remember which post it was, I guessed post 172...I was right. see post # 172.

[relative4]

we talk about them in this thread, its a sticky.

 

http://legacygt.com/forums/showthread.php/idea-web-links-saved-various-parts-219238.html

 

I was trying to remember which post it was, I guessed post 172...I was right. see post # 172.

No, Max, that's for a GT.

[Max Capacity]

No, Max, that's for a GT.

 

Oh yea, your right. I just assumed it was a GT sorry.