got truck checked out,replaced pcv hose passenger side, 3 weeks later throws codes again,any suggestions?
Ford Q&AAsk Your Question
2004 Ford F-150 Heritage Question: p171,p174 codes
backyard tech February 11, 2011, 20:41Master
You have a vac leak. You have either missed other vac hose/connections or you have a intake manifold leak. If you would provide more info on your truck I believe there might be a TSB on that truck. Contact me at email@example.com.
Answer #2ZeeTech February 12, 2011, 08:03Master
Vacuum leak or a failed MAF sensor.
Answer #3bmdouble February 12, 2011, 10:03Master
If it is a 4.2 liter engine you will have to replace the intake spacer.VERY COMMON problem.