CHECK ENGINE LIGHT

  • Tiny
  • Chester&Charlie
  • 1999 Ford Expedition
  • 4WD
  • automatic
  • 320,000 miles

Have a 1999 ford expedition, code 171 & 174 have been read on my OBD 2 scanner. What do has to be checked or replaced to erase these codes?

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Sunday, April 3rd, 2011 AT 4:10 PM

1 Reply

  • Tiny
  • merlin2021
  • Expert
  • 17,589 posts

02 sensors are reading lean, but with that many miles the should be replaced. Also check for vacuum leaks at the pcv rubber elbow its a known leaker.

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Sunday, April 3rd, 2011 AT 5:28 PM

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