2003 Ford Windstar Changed Plugs And Both O2 Sensors Still Giving Codes Po171

2003 FORD WINDSTAR
182,000 MILES
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Changed the plugs & both o2 sensors.Still giving codes po171 &174, it also stumbles during acceleration (bogs down).Gas filter has been changed.
Jan 20, 2013 at 2:13 PM
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ASEMASTER6371
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o2 sensors are not the issue.

low fuel pressure, vacuum leaks, mass air flow sensor or pcv valve are the reasons for these codes.

Roy
Jan 20, 2013 at 2:15 PM
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