86subaru Posted April 15, 2012 Share Posted April 15, 2012 420 code, ozygen sensor?front Link to comment Share on other sites More sharing options...
Legacy777 Posted April 17, 2012 Share Posted April 17, 2012 code 420 is the catalyst efficiency code. You could be getting that code for various reasons. This page has a little more info on the code. http://allwheeldriveauto.com/subaru-check-engine-light-and-code-p0420-explained/ Can you provide any additional details on whether the car is running well or if there's any problems? Link to comment Share on other sites More sharing options...
Prwa101 Posted April 17, 2012 Share Posted April 17, 2012 My 2000 forester popped the same codes, o2 and catty. i ran it a while like that then it started to buck (really sucks). id swap the o2 out it its poping o2 code. Link to comment Share on other sites More sharing options...
86subaru Posted April 18, 2012 Author Share Posted April 18, 2012 car runs fine , 194,000 mi just code every 3 -4 weeks Link to comment Share on other sites More sharing options...
Legacy777 Posted April 18, 2012 Share Posted April 18, 2012 The rear O2 sensor will be the one that would cause this code, so if you get tired of the code, you could try swapping the rear O2 sensor. Link to comment Share on other sites More sharing options...
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