Code PO 171

[wrongturninwv]

2001 Outback 3.0 VDC, check engine light on , code 171. What to look for and the cause. Anybody here had this problem and what did you do to fix it. Cleared code but came back on about 2 hours later. Also VDC off light comes and goes thanks

Edited January 5, 2011 by wrongturninwv

[Legacy777]

Here's some more info on the code, and some possible causes.

 

http://www.obd-codes.com/p0171

[wrongturninwv]

Thanks for the info, now I know what to start looking for. Ran some injector cleaner in a full tank of gas and light is off for now.

[wrongturninwv]

Ran just fine and light went out without having to reset. Best $2.87 I ever spent on Gumout highmileage fuel injector cleaner. Power came back just like it ran when I first bought it.

[Legacy777]

Good to hear it sounds like it's fixed.

[rverdoold]

Ok giving this thread a bump up!

 

I was driving with my propane converted 2009 outback 2.5 when it was giving a hissing sound, like leaking gas under pressure. It was like oops! yes the consumption of propane seems bit higher then before. After getting propane it did not switch to bi-fuel and remained driving on gasoline. Then CEL + VDC + cruise and a code PO171 bank 1 lean. 

The hissing sound had to be a leak, luckily it was a vacuum leak of the propane controller. I could fix it quickly and the car seems to run fine now. 

 

(I used freeSSM and a VAGcom OBD cable to read the codes)