SunnyGardener Posted September 11, 2016 Share Posted September 11, 2016 (edited) The check engine light comes on and the cruise control light blinks and quits working. Computer reader says code 171, running lean. After it's reset, it doesit again when I'm on the road. The interval had become short, and I'mworried about TO WHAT the sensor is responding. Recently replaced an O2sensor, but a week later it happened again, just driving around town. It's hot, but that's no excuse, is it? I'd sure like for this to be fixed, and hope you people have some ideas. Why doesn't it correct the air/fuel mixture? Then maybe the sensor would stop complaining. Edited September 11, 2016 by SunnyGardener Quote Link to comment Share on other sites More sharing options...
matt167 Posted September 11, 2016 Share Posted September 11, 2016 It doesen't because it cant. If you look at live data, you will still see it's adding tons of fuel into the short and long fuel trims, but it can't get the mixture where it wants. So it throws PO171 bank 1 lean.. On an N/A car, 99.99% of the time it points to a vac leak somewhere. The other .1 possibility is that your car has a MAF sensor which is not reading correctly 1 Quote Link to comment Share on other sites More sharing options...
1 Lucky Texan Posted September 12, 2016 Share Posted September 12, 2016 (edited) car details? also, you can get a vacuum gauge on 'loan' from most any parts store. Edited September 12, 2016 by 1 Lucky Texan Quote Link to comment Share on other sites More sharing options...
SunnyGardener Posted September 12, 2016 Author Share Posted September 12, 2016 It's a 2007 outback. Quote Link to comment Share on other sites More sharing options...
SunnyGardener Posted September 12, 2016 Author Share Posted September 12, 2016 Subaru Nut, thanks for your reply. What is N/A? Quote Link to comment Share on other sites More sharing options...
brus brother Posted September 13, 2016 Share Posted September 13, 2016 Subaru Nut, thanks for your reply. What is N/A? Naturally Aspirated Quote Link to comment Share on other sites More sharing options...
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