Question about Ford Mustang

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I have an 2008 base level mustang - 6-banger with 49,000 miles. For the past few days the check engine light has been on, throwing off obd codes 171 and 174.; to lean a mix. have a bunch of options for this. Need to know most likely source of the codes...most commn fix? Fuel filter, MAFS, ? thanks in advance!

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  • Alan Apr 03, 2011

    So if cleaning the MAF does not work, does that mean replacement? or do I need to get the codes cleared before I make that decision? not sure how the OBD works on mustang. on my honda it will clear itself.

  • Alan Apr 03, 2011

    Does that mean if cleaning the MAF does not work it needs replacement? I have not had the codes reset yet. Did not know if the mustang was like my honda and will turn codes off if working properly.?

  • Alan Apr 03, 2011

    Turned out to be clogged fuel filter. replaced, check light off, no codes from OBD.

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Hi, DTCs P0171 and P0174 indicate air/fuel ratio is correcting rich for an overly lean condition. DTCs P0172 and P0175 indicate air/fuel ratio is correcting lean for an overly rich condition. Possible causes are:

  • Fuel system malfunction.
  • EGR system malfunction.
  • Air intake or vacuum system leak.
  • Engine oil level too high.
  • Incorrect cam timing.
  • Restricted air cleaner.
  • Faulty PCV system.
  • Excessive internal engine wear.
  • Inspect engine for obvious defects in specified systems.
Repair as necessary

LEAN DRIVEABILITY SYMPTOMS: MAF SENSOR CONTAMINATION
MAF sensor is the most likely source of code....

Posted on Apr 03, 2011

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