This fords have very comun problems with maf sensors geting contaminated, if you have not or can hear any vacium leaks, the problem is goin to be a conataminated mas air flow snsor (maf)
allow the engine to cold down for at least 15minutes and the remove the air filter hosing and inside has to have a sensor, clean the two liitle resistors inside with brake or carburetor cleaner, allow it to dry and reinstall it.
if this inf help please mark it as fixya ranking after you try what i said
The po171 code is more than likely a lazy oxygen sensor on the drivers side of veh it will be the upstream sensor as there are 2 sensors on each side of the engines exaust upstream being the first one inline eg farthest from muffler as fpr the po174 its the other side oxygen sensor eg passenger side upstream as well these sensors become slow in response time causing intermitent codes before changing these sensors try using highest octane fuel for the next 3 fill ups and change oil if u see no change in intermitent codes then go to local parts store and purchase 2 oxygen sensors both upstream and replace both
good luck
SOURCE: my check engine light came
This means both banks have a lean condition. Most likely if you have a 4.0 SOHC motor your upper intake is sucking in air at the orings at the bottom of the intake. These are really bad about when they are cold in the morning the shrink and let air get by and after the engine warms up the orings soften and seal off.
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thanks, i didn't think the answer was coming so soon, thanks again
Perfect! once a cleaned the sensor the check engine turn off. thanks
I have a 2001 Ford Exployer Sport we replaced the MAF sensor, drove it 60 miles check engine light came on, went to auto zone, got a reading of P171 and 174 autozone cleared the code with computer next day light came on again. suggestions? vehicle runs good no hesitation, suggestions?
I get codes: po171,po174 and po401 on a 98 mercury sable. Is 401 causing the other 2 or vice versa ?.
I changed the air filter on my 2003 Ford Explorer sport Trac, cleaned the MAF, cleaned the injectors, checked for air / vacuum leaks... PO171 code continues to show its face... What else???
p0171 code and p0174
it have check engineon
car runs fine just as service engine soon code p0171 and p0174p/d
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