• Tiny
  • livermanr
  • 2000 Mercury Sable
  • 6 CYL
  • 2WD
  • automatic
  • 1 miles

I have a 2000 Mercury sable. The check engine light was on. The code read system bank #1 and # 2 lean. Codes po 171 and po174. I put new plugs and wires and clened the mass flow sensor and reset the light. I drove about 501 miles and the light came back on What can this be? I can't afford to take it somewhere and have a diagnostics. It is very frustrating. Please help

Monday, June 13th, 2011 AT 11:20 PM

1 Answer

  • Tiny
  • Wrenchtech
  • Expert
  • 19,840 posts

We see these codes a lot and most of the time on a Ford, it's due to a bad vacuum leak. Listen for hissing noise and try to follow it to it's source.

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Monday, June 13th, 2011 AT 11:51 PM

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