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97 ranger a/t 4.0 codes 171/174zingalie 08-30-2005, 02:14 PM have codes 171 and 174 lean bank 1 and 2. o2 sensors? if so whichc ones and if not where should i be looking? thanks. chuck :confused: rivguy 09-06-2005, 02:44 PM no O2 - this is both banks lean - look for any vacume leaks and clean the mass air flow sensor vBulletin®, Copyright ©2009, Jelsoft Enterprises Ltd.
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