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  1. 2

    there has got to be someone with both banks running lean!!

    my truck is a 2004 4x4 4.0 SOHC and i cannot figure out for the life of me what is bringing up these dumb codes and need to pass emissions test in july and wont pass with SES light on both codes r 171, 174 i have checked all vacuum hoses twice and found no leaks replaced both upstream o2 sensors...
  2. 2

    2004 explorer 4.0 sohc

    man i need some help.... my 04 explorer keeps bringing up the same 2 cel codes 171, 174 both banks runing lean... it was bringing up the 191 for fuel rail pressure... it was running a lil crappy and sputtering on acceleration but have since replaced the fuel filter and the sputter went away and...
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