Don's 04 Outback Posted February 3, 2018 Share Posted February 3, 2018 Hi all, We have been getting an intermittent check engine light and finally was able to get the code read. H02S Heater Control Circuit ( Bank 1, Sensor 1) I have seen some of the previous posts on this but am wondering were the sensor is to make the checks? This on our 04 outback, 2.5 with around 160K miles on it. Thank you, 1 Link to comment Share on other sites More sharing options...
golucky66 Posted February 3, 2018 Share Posted February 3, 2018 I'm a little confused. In your title, you said P0300 which is for a random/multiple misfire. Then you mention an O2 sensor circuit code. Which is a different code then P0300. Which code do you have? Link to comment Share on other sites More sharing options...
GeneralDisorder Posted February 3, 2018 Share Posted February 3, 2018 If you got a heater circuit code at 160k, then you need a new upstream O2 sensor. If you got a P0300 that's a horse of a different color and there are many causes - start with NGK plugs and wires and go from there. GD Link to comment Share on other sites More sharing options...
Don's 04 Outback Posted February 6, 2018 Author Share Posted February 6, 2018 That is my mistake the code is P0030 So where would I look for the upstream O2 sensor? Don, Link to comment Share on other sites More sharing options...
montana tom Posted February 6, 2018 Share Posted February 6, 2018 Front catalytic. Link to comment Share on other sites More sharing options...
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