code p0171 2013 subaru forester cel and cruise light on

Asked by sooobie Feb 24, 2021 at 11:21 PM about the 2013 Subaru Forester 2.5X Premium

Question type: Maintenance & Repair

Recently my little soobie's cel and cruise light came on.  I have noticed over
last month that the engine has been knocking esp at lower speeds and when
under a load (accelerating) and has had slower pick up..  SInce the light
came on it stumbles (once at about 35 mph) but mostly at  lower speeds and
even shutters at an idle, like it wants to die.  I only drove a short distance
with cel and cruise light on, so I can't give much more information on how
she behaves since the light came on.   When I hooked up my diagnostic tool
it read  OBD code   P0171            Looking for advice.

2 Answers

930

First check for intake air leaks: hoses, clamps. If you can't find anything it may be the front O2 (air-fuel) sensor.

Hi Ernest Thank you so much. It was the front o2 sensor. I wanted to mention that my car was also slow to accelerate and miles per gallon increased before the cel light came on. After the cel light and cruse light came on. The traction light came on too. Thanks Ernest

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