2004 Ford F-150 Heritage Q&A

2004 Ford F-150 Heritage Question: p171,p174 codes

got truck checked out,replaced pcv hose passenger side, 3 weeks later throws codes again,any suggestions? -
Answer 1
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 autoknowhow@gmail.com. -
Answer 2
Vacuum leak or a failed MAF sensor. Zee -
Answer 3
If it is a 4.2 liter engine you will have to replace the intake spacer.VERY COMMON problem. -
Related Items:
TRUCK RUNS ROUGH AND THE TRUCK SHUTS OFF. SOMETIME IT MISSFIRES AND HAS LOW POWER. ALRIGHT REPLACED THE MAF SENSOR.