jlawlor Posted September 7, 2005 Share Posted September 7, 2005 I believe I need to replace the O2 sensor after the catalytic converter. I was having trouble codes indicating a miss match between the pre cat sensor and the post cat sensor. I removed and cleaned both sensors and they worked fine for a few months. Both sensors were slightly loose fitting and seemed to report trouble during wet periods. I think I had a grounding problem. Now I am getting P0420 -Catalyst efficiency below threshold- indicating a bad sensor after the cat or a bad cat. I would prefer to change the sensor considering my previous troubles. (I wish I could remember the previous code). The dealer part is about $160. I ordered an OEM part from Autozone $69 and ended up with a three wire unit with a triangular plug Bosch #13036. The original is a 4 wire unit with a rectangular plug. They have a 4 wire unit Bosch #13469 that their book indicates is for the pre cat sensor. My pre cat sensor has 5 wires. Does anyone know what part I can use for this. I can solder in a generic but I want to make sure the unit is a match before I go to that much effort. Also, I would not mind paying a little more for an OEM easy plug in install, but I would like to find one from an auto parts store instead of paying the stiff bill from the Subaru Dealership. Quote Link to comment Share on other sites More sharing options...
Legacy777 Posted September 8, 2005 Share Posted September 8, 2005 Try www.subarugenuineparts.com They are a subaru dealership that sells parts online. They are the cheapest online dealer I have dealt with (and always cheaper then your local subaru dealer)....and I've used about 4 or 5 of them now. Quote Link to comment Share on other sites More sharing options...
ofairlane Posted September 8, 2005 Share Posted September 8, 2005 there is a 4 wire o2 sensor out there, ireplaced mine afew months back but i can't remember where i got it but i will look for you. my code was also said cat below threshold and i replaced the cat with a good used one and replaced the sensor also and no codes anymore. i will search for the web site i got the 4 wire sensor and let you know. DanO Quote Link to comment Share on other sites More sharing options...
ofairlane Posted September 8, 2005 Share Posted September 8, 2005 try oxygensensors.com, they have afew 4 wire downstream depending on your vehicle. i used the universal, connected the wires accordingly and it worked fine. good luck. DanO Quote Link to comment Share on other sites More sharing options...
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