Question about Mercury Sable
These are lean codes, 171 is system too lean bank 1 and 174 is system
too lean bank 2. what this relates to is you probably have a vacuum
leak. look under for signs of obvious breaks in vacuum hoses. this is
your most likely culprit.
You can raise your hood and look for any signs of an obvious rubber hose that has come off of anything. The Vacuum situation is sometimes hard for someone to diagnose and we use a smoke machine to find leaks a lot of the time as sometimes it is hard to find a vacuum line that has a small hole or is disconnected.
Posted on Feb 06, 2010
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Posted on Jan 02, 2017
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