on February 17, 2011, 7:17 pm, in reply to "Re: jeep patriot P0171 system too lean"
Low O2 signal could be excess O2 in the exhaust or a faulty signal.
<<< why lean mix if its obviously rich >>>
The ECU is seeing a lean signal from the O2 sensor and so it commands more fuel to compensate.
<<< oxygen level good at .075% >>>
Are you sure there is not excess O2 showing on the gas analyser when the sensor signal is low?
You need to either find where the excess oxygen is coming from or check/repair the sensor signal.
Message Thread | This response ↓ 
Jeep Patriot 2.4 2007 - Fault code P0171 system to lean - Fixed # - Keith Brown February 17, 2011, 4:59 pm
« Back to index | View thread »