on February 17, 2011, 7:08 pm, in reply to "Re: jeep patriot P0171 system too lean"
As far as I can tell from your post the ECU is responding correctly from the info that the Lambda sensor is suppling.
So two options come to mind, first, promote change in the sensor reading and see if the ECU responds to the incoming signal.This will confirm my thoughts.
Smoke test the exhaust system and look for any leaks upstream of the sensor.
Regards Mark
Modern cars, Its all wizardry and witchcraft
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Jeep Patriot 2.4 2007 - Fault code P0171 system to lean - Fixed # - Keith Brown February 17, 2011, 4:59 pm
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