Iltl32 Posted March 12, 2018 Share Posted March 12, 2018 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! Link to comment Share on other sites More sharing options...
madrig Posted March 12, 2018 Share Posted March 12, 2018 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 Link to comment Share on other sites More sharing options...
Infosecdad Posted March 12, 2018 Share Posted March 12, 2018 Do not get aftermarket for the front O2, it'll just be a waste of money. Get the OEM one. Link to comment Share on other sites More sharing options...
relative4 Posted March 12, 2018 Share Posted March 12, 2018 Get a Denso, which is the OEM supplier. Link to comment Share on other sites More sharing options...
Iltl32 Posted March 12, 2018 Author Share Posted March 12, 2018 Get a Denso, which is the OEM supplier. Do you happen to know the Denso part number and/or a good vendor? Link to comment Share on other sites More sharing options...
relative4 Posted March 13, 2018 Share Posted March 13, 2018 234-9123 Amazon Link to comment Share on other sites More sharing options...
Max Capacity Posted March 13, 2018 Share Posted March 13, 2018 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. 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
relative4 Posted March 13, 2018 Share Posted March 13, 2018 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. Link to comment Share on other sites More sharing options...
Max Capacity Posted March 13, 2018 Share Posted March 13, 2018 No, Max, that's for a GT. Oh yea, your right. I just assumed it was a GT sorry. 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
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