Fatenarr Posted November 20, 2016 Share Posted November 20, 2016 Hi everyone my 2009 outback has thrown the p0420 code and is idling rough while at red lights and fuel consumption has gone up lately. I haven't replaced the sensors since purchasing the car at 77,000 miles and it's now at 150,000. Does anyone know what brand the oem sensor is that was originally used? Quote Link to comment Share on other sites More sharing options...
Fairtax4me Posted November 20, 2016 Share Posted November 20, 2016 How old are the spark plugs? Quote Link to comment Share on other sites More sharing options...
Fatenarr Posted November 21, 2016 Author Share Posted November 21, 2016 About 2.5-3 years old. Quote Link to comment Share on other sites More sharing options...
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