on February 18, 2011, 11:09 am, in reply to "Re: jeep patriot P0171 system too lean"
now back to my problem,i still dont think its excess air in system ,my resoning for this is the vehcile runs perfect for about 1min & then it crashes! the upstream sensor is happily adjusting at regular intervals,[sorry cant post scope graph] & then drops to 0v at the same time sensor 2 also drops to 0v,surely rear sensor should now see NO oxygen & attemp to alert the ECM that theres too much fuel in system,by this time emmisions off the scale,your views
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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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