__raj Posted February 11, 2016 Share Posted February 11, 2016 Hi, It seems this code is quite common on the non-turbo Legacy however having trouble weeding thru posts in search for 05 Legacy GT. Our car has 192k miles, original o2 sensors, cat,exhaust and turbo. It did however burn a valve at 170k which was the first CEL that stuck. Are there common reasons for the P0420 code on LGT which has been on for a month? Link to comment Share on other sites More sharing options...
SCASEYS Posted February 12, 2016 Share Posted February 12, 2016 time to replace o2 sensors (do both) I donated to LegacyGT.com which allows me to have this nifty signature. If anything SCASEYS posts ever becomes a sticky i'm gonna light this whole place on fire Link to comment Share on other sites More sharing options...
__raj Posted February 17, 2016 Author Share Posted February 17, 2016 The mechanic turned off light and drove about for a bit and stayed off enough to pass the OBD-II compliance check in NH to pass state inspection/emmisions. Hoping that resolves it but not holding my breath.... Link to comment Share on other sites More sharing options...
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