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Engine ProblemOGGUN108 01-18-2004, 09:38 PM After Tune Up,,my Ford Explorer Is Bein Getting Codes P0171 & Po174,,,any Ideas? Thank You bustedratchet 01-19-2004, 08:44 AM I think that is system too lean bank 1 & 2. I would check to see if you disconnected any vacuum lines. rshepard 03-05-2004, 09:05 PM check the o2 sensors vBulletin®, Copyright ©2009, Jelsoft Enterprises Ltd.
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