Dylan25. Posted July 23, 2017 Share Posted July 23, 2017 I have a 2005 legacy with idle issues. Car starts and idles fine but I can smell that it's running rich then when I apply some throttle and let off the idle drops extremely low and usually the car just stalls. I got one code P0031 HO2S heater control circuit, low bank 1 sensor 1. Could this code be caused by the rich running not the actual problem? Sent from my SM-G930V using Tapatalk Link to comment Share on other sites More sharing options...
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