P0171 & P0174 Lean condition . A number of thing's could cause this , weak fuel pump , plugged fuel filter , vacuum leaks , dirty fuel injectors . Taking your vehicle to a qualified repair shop would be your best bet .
System Too Lean P0171 P0174 Vacuum Leak Quick Test Ford 5 4
Lean Condition Diagnosis on Ford p0171 P0174
Watch some more video's
SOURCE: Code #P0171 & code #P0174
The most common problem on a Ford with these codes is deteriorated PCV hoses. Check the hoses from the PCV valve to the intake manifold. Pay special attention to the rubber elbows. They often crack on the inside curve and the crack is hard to see.
SOURCE: check engine light codes, p0171,
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
SOURCE: P1507 P0171 & P0174 error codes
p0171 indicates the system is running lean on bank 1,p0174 means the system is running to lean on bank 2 p1507 is an idle speed under run fault i'd suspect an air leak is the cause of your problem check air intake system for airleaks
SOURCE: p0171 and p0174 codes
P0171 System too Lean (Bank 1)
P0174 System too Lean (Bank 2)
If a car has a check engine light on and has P0171 and P0174 codes stored, the most likely cause is a vacuum leak. These codes are set by the car’s computer when it sees too much oxygen in the exhaust. Excessive oxygen readings in the exhaust will set lean codes. This does not mean that the oxygen sensors are defective. It is a common mistake for people to replace oxygen sensors when lean codes are present. Just because the code is related to oxygen sensor readings, it doesn’t mean that the oxygen sensors are bad. If both of these codes are stored this means that both banks of the engine have excessive oxygen in the exhaust. If the oxygen sensors are replaced it’s most likely that the same codes will reappear. It is very uncommon for two oxygen sensors to fail at the same time.
Therefore the most likely cause of P0171 and P0174 codes is a vacuum leak. The source of a vacuum leak can be one of many things. The most common cause of a vacuum leak is a leaky hose. Vacuum hoses over time can become dry and brittle. The rubber deteriorates and can leak causing a vacuum loss. Many times a leaky vacuum hose can be found by listening for a hissing sound. A large vacuum leak can even make the car run rough at idle. In some cases it will not idle without feathering the gas pedal.
SOURCE: P2195 CODE ON 2003 FORD EXPLORER SPORT TRAC 4.O
Hello,
Very common concern with the Explorer, Explorer Sport Trac and Ranger with the 4.0l SOHC engine! The upper and lower intake manifold gaskets fail, causing vacuum leaks..It can be Extremely difficult to detect these leaks, because they only leak intermittently (usually in the AM after a cold soak)... As the engine warms up they seal back up! Sometimes the vehicle will idle rough, surge or stall after initial start up, then the symptoms will clear after it gets to operating temperature... Usually there will be no driveability symptoms at all, except the engine light coming on and setting lean codes.. The gaskets have been redesigned to correct this concern..
Bill Andrade Ford Master Technician/ASE Master Technician
1,398 views
Usually answered in minutes!
×