mikaleda Posted October 28, 2015 Share Posted October 28, 2015 I'm trying to fix up this 99 outback I was given and I have ran across a dilemma. The exhaust looked solid to begin with but, I've found a few issues. Firstly I'm missing 2 out of the three o2 sensors,the rear o2 sensor is snapped off flush and is rust welded in, and I have flang issues. Overall the exhaust is structurly solid and I would like to use as much of it as I can, but I don't want to have a check engine lite and I don't see any way of repairing the rear 02 sensor without replacing that section of the exhaust. My question is, can the rear o2 sensor be bypassed without causing a check engine light? I'm not concerned about passing emmisions, I just don't want to have a check engine light on. 1 Link to comment Share on other sites More sharing options...
matt167 Posted October 28, 2015 Share Posted October 28, 2015 look up o2 sensor eliminator. They may still exist, but they may not. They were a resistor that you wired in. I recently welded an o2 sensor bung back in with a stick welder, so if its still there enough, you can fix it. 1 Link to comment Share on other sites More sharing options...
mikaleda Posted October 28, 2015 Author Share Posted October 28, 2015 I was thinking about welding a new o2 bung in myself but, I thought that there might be an easier fix. I thought I remembered the eliminator fix and like you said it was a resistor I beleive. I'll try a search and see if I can find it. Link to comment Share on other sites More sharing options...
mikaleda Posted October 28, 2015 Author Share Posted October 28, 2015 I found a few different eliminator kits, but I'm not sure which one to use. In theory if I got the right resistor I should be able to solder it in and call it good. Link to comment Share on other sites More sharing options...
mikaleda Posted October 28, 2015 Author Share Posted October 28, 2015 I can't find much info on where to get the eliminator kits and when I did a google search it seems they make them for bikes more than cars. I found a post talking about this and I think it says that the rear o2 needs to see 450mv to be in optimal range. So if I were to buy a 450mv resitor thereticaly I could solder that into the circuit and eliminate the rear o2 sensor? Link to comment Share on other sites More sharing options...
mikaleda Posted October 28, 2015 Author Share Posted October 28, 2015 Okay obviously that wasn't correct since I forgot resistors are measured in ohms and not milivolts. Damn this is confusing as heck. Link to comment Share on other sites More sharing options...
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