mike97 Posted March 3, 2009 Share Posted March 3, 2009 I own a 97 subaru legacy 2.5 gt and i got that code po420 catalyst efficiency below threshold .what does that mean and what can I do ?thanks Link to comment Share on other sites More sharing options...
davebugs Posted March 4, 2009 Share Posted March 4, 2009 Start by searching for P0420 here. Read a few threads. Link to comment Share on other sites More sharing options...
mike97 Posted March 4, 2009 Author Share Posted March 4, 2009 I am sorry I am new to USMB .i love the site .I wish i new about this 2 months ago .thanks alot:) Link to comment Share on other sites More sharing options...
johnceggleston Posted March 4, 2009 Share Posted March 4, 2009 I own a 97 subaru legacy 2.5 gt and i got that code po420 catalyst efficiency below threshold .what does that mean and what can I do ?thanks typically it's the front o2 sensor, buy a subaru sensor only. Link to comment Share on other sites More sharing options...
davebugs Posted March 4, 2009 Share Posted March 4, 2009 I am sorry I am new to USMB .i love the site .I wish i new about this 2 months ago .thanks alot:) No worries. I often have trouble finding what I'm looking for with search but this code is often asked. There is an awful lot of excellent information here and good folks as well. Link to comment Share on other sites More sharing options...
EVOthis Posted March 5, 2009 Share Posted March 5, 2009 How many miles are on the car?...As suggested I would throw a front 02 in it...You dont want to go spending $500-$1000+ dollars on something a new sensor could fix....Of course you could always try clearing the code and see if it comes back... Link to comment Share on other sites More sharing options...
mike97 Posted March 5, 2009 Author Share Posted March 5, 2009 I changed both o2 sencers .and un did the battery and now light on yet .I think i am going to get some carb cleaner and clean my throdel body Link to comment Share on other sites More sharing options...
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