Question about 1998 Ford Expedition

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98 EXPEDITION CODES 171 174 HOW TO FIX - 1998 Ford Expedition

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This is either a vacuum line or clogged EGR valve. This is the first thing to fix. Other problem is intake manifold.Cleaning will usually fix it, but change the gaskets and change isolator bolts.

Posted on Oct 16, 2009

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Sir, I don't think these are any codes. They must be P0171 and P0174. If it is like this, I can tell what to do. About P0171 and P0171, it is a code which alerts the user that the System is extensively leaning. This issue can only be handled by a certified Technician or Dealer. Contact them, they will check the Car's Health.
Thank you Sir, Have a nice day.

Posted on Sep 26, 2009

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Posted on Jan 02, 2017

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SOURCE: codes #171 & 174

first check out for o2 sensor if its faulty this can show up.but if its proper.Evaporative emission control system leak very small 171 System too lean (bank 1) 174 System too lean (bank 2) 

Posted on Jan 05, 2009

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