zero260 Posted July 26, 2016 Share Posted July 26, 2016 I need confirmation on what I'm thinking. I but a new front o2 sensor in after I rebuilt my motor and have driven about 300 miles. I just flashed my ECU to correct a few things and got a P0134 almost immediately after flashing. I logged a drive around my neighborhood and it was 14.7 the entire time. I also noticed when I was logging previously it read 14.7 the entire time. Did I get a faulty o2 sensor out of the box? it's a Denso unit, not bought OEM, but Denso makes the OEM units.romraiderlog_20160725_195512.csv Link to comment Share on other sites More sharing options...
grovlet Posted July 26, 2016 Share Posted July 26, 2016 Certainly seems odd - that code is not listed as a normal Subaru Code - but seems to be a generic Code for "No Sensor Activity" Personally - to me it would seem like the plug or wiring is either cut/broken or maybe just disconnected? Or better yet did you code out the 02 sensor in the tune and that's not set correctly? Link to comment Share on other sites More sharing options...
FJuan Posted July 26, 2016 Share Posted July 26, 2016 Did you install the O2 sensor (A/F ratio sensor) before you installed the motor or after the motor was in? #1 issue when installing a motor is people install the O2 sensor before. The problem here is, the O2 sensor sticks out far enough that it bangs against the sub frame in the engine well when aligning the motor up to the trans. All it takes is a few bangs and the O2 is damaged. If this is the case, you will need to buy a new O2 sensor. I'm guilty of doing this too, lesson learned. My wife's balls are delicious. Link to comment Share on other sites More sharing options...
zero260 Posted July 26, 2016 Author Share Posted July 26, 2016 Well, i changed the o2 sensor or under warranty and for the same code. My current tune has cel code p0031 shut off to eliminate my cel. I went back to stock tune and only p0031 comes on. But on my custom tune the p0134 comes on. So I adjusted my tune to allow p0031 to through a code and it doesn't throw p0134 anymore. But my logger still only records 14.7 on my front o2. Anyone have any ideas on that? Link to comment Share on other sites More sharing options...
cBax Posted July 28, 2016 Share Posted July 28, 2016 I had one today that just pegged 15.5 no matter what. Replaced with a new Denso and worked great. I think if you are getting static values, either the sensor is no good or there's a problem with wiring. The code we were getting was an upstream o2 low circuit code. Can verify actual code later. '05 Outback XT www.facebook.com/baxleysspeedshop www.baxleysspeedshop.com Link to comment Share on other sites More sharing options...
zero260 Posted July 29, 2016 Author Share Posted July 29, 2016 So I started diagnostic per the FSM, didn't have any voltage at the harness, Found a fuse marked SBF-5 to be burnt out, replaced it and now its working perfectly Link to comment Share on other sites More sharing options...
FJuan Posted July 29, 2016 Share Posted July 29, 2016 Sounds good, hope that was the main problem. My wife's balls are delicious. Link to comment Share on other sites More sharing options...
Max Capacity Posted July 31, 2016 Share Posted July 31, 2016 So I started diagnostic per the FSM, didn't have any voltage at the harness, Found a fuse marked SBF-5 to be burnt out, replaced it and now its working perfectly Great to hear you know how to use the tables Good Job. 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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